Q: What are the prime factors of the number 25,264,640?

 A: 2, 5, 71, 139

Why are those the prime factors of the number 25,264,640?

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 25,264,640

25,264,640
Factor Arrows
212,632,320
Factor Arrows
26,316,160
Factor Arrows
23,158,080
Factor Arrows
21,579,040
Factor Arrows
2789,520
Factor Arrows
2394,760
Factor Arrows
2197,380
Factor Arrows
298,690
Factor Arrows
249,345
Factor Arrows
59,869
Factor Arrows
71139

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, 5, 71, 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 2 x 2 x 5 x 71 x 139 = 25,264,640

This can also be written as 29 x 51 x 711 x 1391 = 25,264,640

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


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