Q: What are the prime factors of the number 108,864?

 A: 2, 3, 7

Why are those the prime factors of the number 108,864?

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 108,864

108,864
Factor Arrows
254,432
Factor Arrows
227,216
Factor Arrows
213,608
Factor Arrows
26,804
Factor Arrows
23,402
Factor Arrows
21,701
Factor Arrows
3567
Factor Arrows
3189
Factor Arrows
363
Factor Arrows
321
Factor Arrows
37

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, 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 3 x 3 x 3 x 3 x 3 x 7 = 108,864

This can also be written as 26 x 35 x 71 = 108,864

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


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