Q: What are the prime factors of the number 105,730,816?

 A: 2, 23, 17957

Why are those the prime factors of the number 105,730,816?

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 105,730,816

105,730,816
Factor Arrows
252,865,408
Factor Arrows
226,432,704
Factor Arrows
213,216,352
Factor Arrows
26,608,176
Factor Arrows
23,304,088
Factor Arrows
21,652,044
Factor Arrows
2826,022
Factor Arrows
2413,011
Factor Arrows
2317,957

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, 23, 17957

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 23 x 17,957 = 105,730,816

This can also be written as 28 x 231 x 17,9571 = 105,730,816

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


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