Q: What are the prime factors of the number 25,711,616?

 A: 2, 7, 17, 211

Why are those the prime factors of the number 25,711,616?

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 25,711,616

25,711,616
Factor Arrows
212,855,808
Factor Arrows
26,427,904
Factor Arrows
23,213,952
Factor Arrows
21,606,976
Factor Arrows
2803,488
Factor Arrows
2401,744
Factor Arrows
2200,872
Factor Arrows
2100,436
Factor Arrows
250,218
Factor Arrows
225,109
Factor Arrows
73,587
Factor Arrows
17211

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, 17, 211

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 2 x 2 x 7 x 17 x 211 = 25,711,616

This can also be written as 210 x 71 x 171 x 2111 = 25,711,616

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


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