 # Factors of 638: Prime Factorization, Methods, and Examples

The number 638 is not a perfect square number but it is an even composite number. The composite number means it has eight factors which are more than two. When these eight factors are used as divisors and 638 as dividends then as a result it gives no residue with the whole number as quotient.

### Factors of 638

Here are the factors of number 638.

Factors of 638: 1, 2, 11, 22, 29, 58, 319, and 638

### Negative Factors of 638

The negative factors of 638 are similar to their positive aspects, just with a negative sign.

Negative Factors of 638: 1, 2, 11, 22, 29, 58, 319, and 638

### Prime Factorization of 638

The prime factorization of 638 is the way of expressing its prime factors in the product form.

Prime Factorization: 2 x 11 x 29

In this article, we will learn about the factors of 638 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

## What Are the Factors of 638?

The factors of 638 are 1, 2, 11, 22, 29, 58, 319, and 638. These numbers are the factors as they do not leave any remainder when divided by 638.

The factors of 638 are classified as prime numbers and composite numbers. The prime factors of the number 638 can be determined using the prime factorization technique.

## How To Find the Factors of 638?

You can find the factors of 638 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 638, create a list containing the numbers that are exactly divisible by 638 with zero remainders. One important thing to note is that 1 and 638 are the 638’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 638 are determined as follows:

$\dfrac{638}{1} = 638$

$\dfrac{638}{2} = 319$

$\dfrac{638}{11} = 58$

$\dfrac{638}{22} = 29$

$\dfrac{638}{29} = 22$

$\dfrac{638}{58} = 11$

$\dfrac{638}{319} = 2$

$\dfrac{638}{638} = 1$

Therefore, 1, 2, 11, 22, 29, 58, 319, and 638 are the factors of 638.

### Total Number of Factors of 638

For 638, there are eight positive factors and eight negative ones. So in total, there are sixteen factors of 638.

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 638 is given as:

Factorization of 638 is 2 x 11 x 29.

The exponent of 2, 11, and 29 is 1.

Adding 1 to each and multiplying them together results in 8.

Therefore, the total number of factors of 638 is sixteen whereas eight are positive, and eight 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 638 by Prime Factorization

The number 638 is a composite. 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 638 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 638, 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 638 can be expressed as:

638 = 2 x 11 x 29

## Factors of 638 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 638, the factor pairs can be found as:

1 x 638 = 638

2 x 319 = 638

11 x 58 = 638

22 x 29 = 638

The possible factor pairs of 638 are given as (1, 638), (2, 319), (11, 58), and (22, 29).

All these numbers in pairs, when multiplied, give 638 as the product.

The negative factor pairs of 638 are given as:

-1 x -638 = 638

-2 x -319 = 638

-11 x -58 = 638

-22 x -29 = 638

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, -11, -22, -29, -58, -319, and -638 are called negative factors of 638.

The list of all the factors of 638, including positive as well as negative numbers, is given below.

Factor list of 638: 1, -1, 2, -2, 11, -11, 22, -22, 29, -29, 58, -58, 319, -319, 638 and -638

## Factors of 638 Solved Examples

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

### Example 1

How many factors of 638 are there?

### Solution

The total number of Factors of 638 is 8.

Factors of 638 are 1, 2, 11, 22, 29, 58, 319, and 638.

### Example 2

Find the factors of 638 using prime factorization.

### Solution

The prime factorization of 638 is given as:

638 $\div$ 2 = 319

319 $\div$ 11 = 29

29 $\div$ 29 = 1

So the prime factorization of 638 can be written as:

2 x 11 x 29 = 638