Factors of 639: Prime Factorization, Methods, and Examples

In the given solution we see the factor of an odd number 639 which is a composite number having more than 2 factors and were completely divisible by 639 without decimal places number as quotient.

Factors Of 639

Factors of 639

Here are the factors of number 639.

Factors of 639: 1, 3, 9, 71, 213, and 639

Negative Factors of 639

The negative factors of 639 are similar to their positive aspects, just with a negative sign.

Negative Factors of 639: -1, -3, -9, -71, -213, and -639

Prime Factorization of 639

The prime factorization of 639 is the way of expressing its prime factors in the product form.

Prime Factorization: 3 x 3 x 71

In this article, we will learn about the factors of 639 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

What Are the Factors of 639?

The factors of 639 are 1, 3, 9, 71, 213, and 639. These numbers are the factors as they do not leave any remainder when divided by 639.

The factors of 639 are classified as prime numbers and composite numbers. The prime factors of the number 639 can be determined using the prime factorization technique.

How To Find the Factors of 639?

You can find the factors of 639 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 639, create a list containing the numbers that are exactly divisible by 639 with zero remainders. One important thing to note is that 1 and 639 are the 639’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 639 are determined as follows:

\[\dfrac{639}{1} = 639\]

\[\dfrac{639}{3} = 213\]

\[\dfrac{639}{9} = 71\]

\[\dfrac{639}{71} = 9\]

\[\dfrac{639}{213} = 3\]

\[\dfrac{639}{639} = 1\]

Therefore, 1, 3, 9, 71, 213, and 639 are the factors of 639.

Total Number of Factors of 639

For 639, there are six positive factors and six negative ones. So in total, there are twelve factors of 639. 

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 639 is given as:

Factorization of 639 is 3 x 3 x 71.

The exponent of 3, 3, 71 is 2 and 1.

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

Therefore, the total number of factors of 639 is twelve whereas six are positive, and six 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 639 by Prime Factorization

The number 639 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.prime factorization of 639

Before finding the factors of 639 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 639, 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 639 can be expressed as:

639 = 3 x 3 x 71

Factors of 639 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.Factors of 639 in Pairs

For 639, the factor pairs can be found as:

1 x 639 = 639

3 x 213 = 639

9 x 71 = 639

The possible factor pairs of 639 are given as (1, 639), (3, 213), and (9, 71).

All these numbers in pairs, when multiplied, give 639 as the product.

The negative factor pairs of 639 are given as:

-1 x -639 = 639

-3 x -213 = 639

-9 x -71 = 639

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, -3, -9, -71, -213, and -639 are called negative factors of 639.

The list of all the factors of 639, including positive as well as negative numbers, is given below.

Factor list of 639: 1, -1, 3, -3, 9, -9, 71, -71, 213, -213, 639 and -639

Factors of 639 Solved Examples

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

Example 1

How many factors of 639 are there?


The total number of Factors of 639 is six.

Factors of 639 are 1, 3, 9, 71, 213, and 639.

Example 2

Find the factors of 639 using prime factorization.


The prime factorization of 639 is given as:

639 $\div$ 3 = 213 

213 $\div$ 3 = 71 

71 $\div$ 71 = 1 

So the prime factorization of 639 can be written as:

3 x 3 x 71 = 639

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