Q: What are the prime factors of the number 851,904?

 A: 2, 3, 17, 29

Why are those the prime factors of the number 851,904?

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 851,904

851,904
Factor Arrows
2425,952
Factor Arrows
2212,976
Factor Arrows
2106,488
Factor Arrows
253,244
Factor Arrows
226,622
Factor Arrows
213,311
Factor Arrows
34,437
Factor Arrows
31,479
Factor Arrows
3493
Factor Arrows
1729

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, 17, 29

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 17 x 29 = 851,904

This can also be written as 26 x 33 x 171 x 291 = 851,904

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


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