Q: What are the prime factors of the number 25,341,440?

 A: 2, 5, 19, 521

Why are those the prime factors of the number 25,341,440?

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 25,341,440

25,341,440
Factor Arrows
212,670,720
Factor Arrows
26,335,360
Factor Arrows
23,167,680
Factor Arrows
21,583,840
Factor Arrows
2791,920
Factor Arrows
2395,960
Factor Arrows
2197,980
Factor Arrows
298,990
Factor Arrows
249,495
Factor Arrows
59,899
Factor Arrows
19521

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, 19, 521

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 19 x 521 = 25,341,440

This can also be written as 29 x 51 x 191 x 5211 = 25,341,440

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


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