Factors of 640 in pairs

Factors are pairs of numbers which, if multiplied together, give the original number.

The number 640 is a composite number. So, 640 has more than one factor pair.

These are all the factor pairs of 640:

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

Here is how to find the factor pairs for the number 640:

• 640 divided by 1 is 640. So, (1, 640) is a factor pair of 640
• 640 divided by 2 is 320. So, (2, 320) is a factor pair of 640
• 640 divided by 4 is 160. So, (4, 160) is a factor pair of 640
• 640 divided by 5 is 128. So, (5, 128) is a factor pair of 640
• 640 divided by 8 is 80. So, (8, 80) is a factor pair of 640
• 640 divided by 10 is 64. So, (10, 64) is a factor pair of 640
• 640 divided by 16 is 40. So, (16, 40) is a factor pair of 640
• 640 divided by 20 is 32. So, (20, 32) is a factor pair of 640

Factor pairs of 640 that ads up to a number:

• The factors of 640 that adds up to 641 are 1 and 640
• The factors of 640 that adds up to 642 are 2 and 320
• The factors of 640 that adds up to 644 are 4 and 160
• The factors of 640 that adds up to 645 are 5 and 128
• The factors of 640 that adds up to 648 are 8 and 80
• The factors of 640 that adds up to 650 are 10 and 64
• The factors of 640 that adds up to 656 are 16 and 40
• The factors of 640 that adds up to 660 are 20 and 32

Note 1: if we change the order of all pairs above, we can double the number of pairs. We choose not to show them.
Note 2: do not confuse these pairs with prime factors. See below some info:

The factorization or decomposition of 640 is 2⁷•5.

The prime factors of 640 are 2 and 5. It is the list of the integer's prime factors.