Q: What are the prime factors of the number 638,705?

Why are those the prime factors of the number 638,705?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 638,705

	638,705
5		127,741
	139		919

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

5, 139, 919

We can check our work by multiplying all of the prime factors together: 5 x 139 x 919 = 638,705

This can also be written as 5¹ x 139¹ x 919¹ = 638,705

If you would like to know more, or need additional explanation, please review our prime factorization explanation.

More Examples

Here are some more numbers to try:

Try the factor calculator