Q: What are the prime factors of the number 404,605,120?

 A: 2, 5, 163, 7757

Why are those the prime factors of the number 404,605,120?

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 404,605,120

404,605,120
Factor Arrows
2202,302,560
Factor Arrows
2101,151,280
Factor Arrows
250,575,640
Factor Arrows
225,287,820
Factor Arrows
212,643,910
Factor Arrows
26,321,955
Factor Arrows
51,264,391
Factor Arrows
1637,757

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:

2, 5, 163, 7757

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 5 x 163 x 7,757 = 404,605,120

This can also be written as 26 x 51 x 1631 x 7,7571 = 404,605,120

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


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