Q: What are the prime factors of the number 87,808?

 A: 2, 7

Why are those the prime factors of the number 87,808?

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 87,808

87,808
Factor Arrows
243,904
Factor Arrows
221,952
Factor Arrows
210,976
Factor Arrows
25,488
Factor Arrows
22,744
Factor Arrows
21,372
Factor Arrows
2686
Factor Arrows
2343
Factor Arrows
749
Factor Arrows
77

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

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 2 x 2 x 7 x 7 x 7 = 87,808

This can also be written as 28 x 73 = 87,808

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


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