Factors of 639 are the list of integers that can be evenly divided into 639. It has a total of 6 factors of which 639 is the biggest factor and the positive factors of 639 are 1, 3, 9, 71, 213, 639. The Prime Factors of 639 are 3 × 71 and its Factors in Pairs are (1, 639), (3, 213), (9, 71).

• All Factors of 639: 1, 3, 9, 71, 213 and 639
• Negative Factors of 639: -1, -3, -9, -71, -213 and -639
• Prime Factors of 639: 3, 71
• Prime Factorization of 639: 3² × 71¹
• Sum of Factors of 639: 936

1.	What Are the Factors of 639?
2.	Factors of 639 by Prime Factorization
3.	Factors of 639 in Pairs
4.	FAQs on Factors of 639

Factors of 639 are pairs of those numbers whose products result in 639. These factors are either prime numbers or composite numbers.

How to Find the Factors of 639?

To find the factors of 639, we will have to find the list of numbers that would divide 639 without leaving any remainder.

• 639/71 = 9; therefore, 71 is a factor of 639 and 9 is also a factor of 639.
• 639/213 = 3; therefore, 213 is a factor of 639 and 3 is also a factor of 639.

Similarly we can find other factors. Hence, the factors of 639 are 1, 3, 9, 71, 213, 639.

☛ Also Check:

• Factors of 22 - The factors of 22 are 1, 2, 11, 22
• Factors of 17 - The factors of 17 are 1, 17
• Factors of 91 - The factors of 91 are 1, 7, 13, 91
• Factors of 180 - The factors of 180 are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180
• Factors of 36 - The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36

The number 639 is composite and therefore it will have prime factors. Now let us learn how to calculate the prime factors of 639. The first step is to divide the number 639 with the smallest prime factor, here it is 3. We keep dividing until it gives a non-zero remainder.

• 639 ÷ 3 = 213
• 213 ÷ 3 = 71

Further dividing 71 by 3 gives a non-zero remainder. So we stop the process and continue dividing the number 71 by the next smallest prime factor. We stop ultimately if the next prime factor doesn't exist or when we can't divide any further.

So, the prime factorization of 639 can be written as 3² × 71¹ where 3, 71 are prime.

Pair factors of 639 are the pairs of numbers that when multiplied give the product 639. The factors of 639 in pairs are:

• 1 × 639 = (1, 639)
• 3 × 213 = (3, 213)
• 9 × 71 = (9, 71)

Negative pair factors of 639 are:

• -1 × -639 = (-1, -639)
• -3 × -213 = (-3, -213)
• -9 × -71 = (-9, -71)

NOTE: If (a, b) is a pair factor of a number then (b, a) is also a pair factor of that number.