Q: What are the prime factors of the number 105,446,656?

 A: 2, 7, 19, 163

Why are those the prime factors of the number 105,446,656?

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 105,446,656

105,446,656
Factor Arrows
252,723,328
Factor Arrows
226,361,664
Factor Arrows
213,180,832
Factor Arrows
26,590,416
Factor Arrows
23,295,208
Factor Arrows
21,647,604
Factor Arrows
2823,802
Factor Arrows
2411,901
Factor Arrows
758,843
Factor Arrows
193,097
Factor Arrows
19163

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, 19, 163

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 19 x 19 x 163 = 105,446,656

This can also be written as 28 x 71 x 192 x 1631 = 105,446,656

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


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