Q: What are the prime factors of the number 25,780,608?

 A: 2, 3, 7, 23, 139

Why are those the prime factors of the number 25,780,608?

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 25,780,608

25,780,608
Factor Arrows
212,890,304
Factor Arrows
26,445,152
Factor Arrows
23,222,576
Factor Arrows
21,611,288
Factor Arrows
2805,644
Factor Arrows
2402,822
Factor Arrows
2201,411
Factor Arrows
367,137
Factor Arrows
322,379
Factor Arrows
73,197
Factor Arrows
23139

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, 23, 139

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 3 x 3 x 7 x 23 x 139 = 25,780,608

This can also be written as 27 x 32 x 71 x 231 x 1391 = 25,780,608

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


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