Q: What are the prime factors of the number 405,376,704?

 A: 2, 3, 19, 12347

Why are those the prime factors of the number 405,376,704?

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 405,376,704

405,376,704
Factor Arrows
2202,688,352
Factor Arrows
2101,344,176
Factor Arrows
250,672,088
Factor Arrows
225,336,044
Factor Arrows
212,668,022
Factor Arrows
26,334,011
Factor Arrows
32,111,337
Factor Arrows
3703,779
Factor Arrows
3234,593
Factor Arrows
1912,347

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, 3, 19, 12347

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 3 x 3 x 3 x 19 x 12,347 = 405,376,704

This can also be written as 26 x 33 x 191 x 12,3471 = 405,376,704

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


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