Q: What are the prime factors of the number 687,315,776?

 A: 2, 7, 29, 52903

Why are those the prime factors of the number 687,315,776?

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 687,315,776

687,315,776
Factor Arrows
2343,657,888
Factor Arrows
2171,828,944
Factor Arrows
285,914,472
Factor Arrows
242,957,236
Factor Arrows
221,478,618
Factor Arrows
210,739,309
Factor Arrows
71,534,187
Factor Arrows
2952,903

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, 7, 29, 52903

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 7 x 29 x 52,903 = 687,315,776

This can also be written as 26 x 71 x 291 x 52,9031 = 687,315,776

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


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