Factors of 640 are the list of integers that we can split evenly into 640. There are 16 factors of 640 of which 640 itself is the biggest factor and its prime factors are 2, 5 The sum of all factors of 640 is 1530.

• All Factors of 640: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320 and 640
• Prime Factors of 640: 2, 5
• Prime Factorization of 640: 2⁷ × 5¹
• Sum of Factors of 640: 1530

1.	What Are the Factors of 640?
2.	Factors of 640 by Prime Factorization
3.	Factors of 640 in Pairs
4.	FAQs on Factors of 640

Factors of 640 are pairs of those numbers whose products result in 640. These factors are either prime numbers or composite numbers.

How to Find the Factors of 640?

To find the factors of 640, we will have to find the list of numbers that would divide 640 without leaving any remainder.

• 640/320 = 2; therefore, 320 is a factor of 640 and 2 is also a factor of 640.
• 640/64 = 10; therefore, 64 is a factor of 640 and 10 is also a factor of 640.

Similarly we can find other factors. Hence, the factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640.

☛ Also Check:

• Factors of 11 - The factors of 11 are 1, 11
• Factors of 8 - The factors of 8 are 1, 2, 4, 8
• Factors of 65 - The factors of 65 are 1, 5, 13, 65
• Factors of 33 - The factors of 33 are 1, 3, 11, 33
• Factors of 49 - The factors of 49 are 1, 7, 49

The number 640 is composite and therefore it will have prime factors. Now let us learn how to calculate the prime factors of 640. The first step is to divide the number 640 with the smallest prime factor, here it is 2. We keep dividing until it gives a non-zero remainder.

• 640 ÷ 2 = 320
• 320 ÷ 2 = 160
• 160 ÷ 2 = 80
• 80 ÷ 2 = 40
• 40 ÷ 2 = 20
• 20 ÷ 2 = 10
• 10 ÷ 2 = 5

Further dividing 5 by 2 gives a non-zero remainder. So we stop the process and continue dividing the number 5 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 640 can be written as 2⁷ × 5¹ where 2, 5 are prime.

Pair factors of 640 are the pairs of numbers that when multiplied give the product 640. The factors of 640 in pairs are:

• 1 × 640 = (1, 640)
• 2 × 320 = (2, 320)
• 4 × 160 = (4, 160)
• 5 × 128 = (5, 128)
• 8 × 80 = (8, 80)
• 10 × 64 = (10, 64)
• 16 × 40 = (16, 40)
• 20 × 32 = (20, 32)

Negative pair factors of 640 are:

• -1 × -640 = (-1, -640)
• -2 × -320 = (-2, -320)
• -4 × -160 = (-4, -160)
• -5 × -128 = (-5, -128)
• -8 × -80 = (-8, -80)
• -10 × -64 = (-10, -64)
• -16 × -40 = (-16, -40)
• -20 × -32 = (-20, -32)

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