 # Factors of 640: Prime Factorization, Methods, and Examples

There are almost thirty-two factors of the number 640 which includes positive as well as negative factors. In this solution, we see the prime factors of 640 as well as the exponent of that number.

### Factors of 640

Here are the factors of number 640.

Factors of 640: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, and 640

### Negative Factors of 640

The negative factors of 640 are similar to its positive aspects, just with a negative sign.

Negative Factors of 640: -1, -2, -4, -5, -8, -10, -16, -20, -32, -40, -64, -80, -128, -160, -320, and -640

### Prime Factorization of 640

The prime factorization of 640 is the way of expressing its prime factors in the product form.

Prime Factorization: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

In this article, we will learn about the factors of 640 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

## What Are the Factors of 640?

The factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, and 640. These numbers are the factors as they do not leave any remainder when divided by 640.

The factors of 640 are classified as prime numbers and composite numbers. The prime factors of the number 640 can be determined using the prime factorization technique.

## How To Find the Factors of 640?

You can find the factors of 640 by using the rules of divisibility. The divisibility rule states that any number, when divided by any other natural number, is said to be divisible by the number if the quotient is the whole number and the resulting remainder is zero.

To find the factors of 640, create a list containing the numbers that are exactly divisible by 640 with zero remainders. One important thing to note is that 1 and 640 are the 640’s factors as every natural number has 1 and the number itself as its factor.

1 is also called the universal factor of every number. The factors of 640 are determined as follows:

$\dfrac{640}{1} = 640$

$\dfrac{640}{2} = 320$

$\dfrac{640}{4} = 160$

$\dfrac{640}{5} = 128$

$\dfrac{640}{8} = 80$

$\dfrac{640}{10} = 64$

$\dfrac{640}{16} = 40$

$\dfrac{640}{20} = 32$

Therefore, 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, and 640 are the factors of 640.

### Total Number of Factors of 640

For 640, there are 16 positive factors and 16 negative ones. So in total, there are 32 factors of 640.

To find the total number of factors of the given number, follow the procedure mentioned below:

1. Find the factorization/prime factorization of the given number.
2. Demonstrate the prime factorization of the number in the form of exponent form.
3. Add 1 to each of the exponents of the prime factor.
4. Now, multiply the resulting exponents together. This obtained product is equivalent to the total number of factors of the given number.

By following this procedure, the total number of factors of 640 is given as:

Factorization of 640 is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5.

The exponent of 2, 5 is 7 and 1.

Adding 1 to each and multiplying them together results in 16.

Therefore, the total number of factors of 640 is 32 whereas 16 are positive, and 16 factors are negative.

### Important Notes

Here are some essential points that must be considered while finding the factors of any given number:

• The factor of any given number must be a whole number.
• The factors of the number cannot be in the form of decimals or fractions.
• Factors can be positive as well as negative.
• Negative factors are the additive inverse of the positive factors of a given number.
• The factor of a number cannot be greater than that number.
• Every even number has 2 as its prime factor, the smallest prime factor.

## Factors of 640 by Prime Factorization

The number 640 is a composite/prime number. Prime factorization is a valuable technique for finding the number’s prime factors and expressing the number as the product of its prime factors. Before finding the factors of 640 using prime factorization, let us find out what prime factors are. Prime factors are the factors of any given number that are only divisible by 1 and themselves.

To start the prime factorization of 640, start dividing by its most minor prime factor. First, determine that the given number is either even or odd. If it is an even number, then 2 will be the smallest prime factor.

Continue splitting the quotient obtained until 1 is received as the quotient. The prime factorization of 640 can be expressed as:

640 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

## Factors of 640 in Pairs

The factor pairs are the duplet of numbers that, when multiplied together, result in the factorized number. Factor pairs can be more than one depending on the total number of factors given. For 640, the factor pairs can be found as:

1 x 640 = 640

2 x 320 = 640

4 x 160 = 640

5 x 128 = 640

8 x 80 = 640

10 x 64 = 640

16 x 40 = 640

20 x 32 = 640

The possible factor pairs of 640 are given as (1, 640), (2, 320), (4, 160), (5, 128), (8, 80), (10, 64), (16,40) and (20, 32).

All these numbers in pairs, when multiplied, give 640 as the product.

The negative factor pairs of 640 are given as:

-1 x -640 = 640

-2 x -320 = 640

-4 x -160 = 640

-5 x -128 = 640

-8 x -80 = 640

-10 x -64 = 640

-16 x -40 = 640

-20 x -32 = 640

It is important to note that in negative factor pairs, the minus sign has been multiplied by the minus sign, due to which the resulting product is the original positive number. Therefore, -1, -2, -4, -5, -8, -10, -16, -20, -32, -40, -64, -80, -128, -160, -320, and -640 are called negative factors of 640.

The list of all the factors of 640, including positive as well as negative numbers, is given below.

Factor list of 640: 1, -1, 2, -2,  4, -4,  5, -5, 8, -8, 10, -10, 16, -16, 20, -20, 32, -32, 40, -40, 64, -64, 80, -80, 128, -128, 160, -160, 320, -320, 640 and -640

## Factors of 640 Solved Examples

To better understand the concept of factors, let’s solve some examples.

### Example 1

How many factors of 640 are there?

### Solution

The total number of Factors of 640 is 16.

Factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, and 640.

### Example 2

Find the factors of 640 using prime factorization.

### Solution

The prime factorization of 640 is given as:

640 $\div$ 2 = 320

320 $\div$ 2 = 160

160 $\div$ 2 = 80

80 $\div$ 2 = 40

40 $\div$ 2 = 20

20 $\div$ 2 = 10

10 $\div$ 2 = 5

5 $\div$ 5 = 1

So the prime factorization of 640 can be written as:

2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 = 640