Q: What are the prime factors of the number 687,652,416?

 A: 2, 3, 11, 31, 389

Why are those the prime factors of the number 687,652,416?

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 687,652,416

687,652,416
Factor Arrows
2343,826,208
Factor Arrows
2171,913,104
Factor Arrows
285,956,552
Factor Arrows
242,978,276
Factor Arrows
221,489,138
Factor Arrows
210,744,569
Factor Arrows
33,581,523
Factor Arrows
31,193,841
Factor Arrows
3397,947
Factor Arrows
3132,649
Factor Arrows
1112,059
Factor Arrows
31389

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, 11, 31, 389

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 3 x 11 x 31 x 389 = 687,652,416

This can also be written as 26 x 34 x 111 x 311 x 3891 = 687,652,416

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


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