Q: What are the prime factors of the number 25,530,400?

 A: 2, 5, 7, 47, 97

Why are those the prime factors of the number 25,530,400?

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 25,530,400

25,530,400
Factor Arrows
212,765,200
Factor Arrows
26,382,600
Factor Arrows
23,191,300
Factor Arrows
21,595,650
Factor Arrows
2797,825
Factor Arrows
5159,565
Factor Arrows
531,913
Factor Arrows
74,559
Factor Arrows
4797

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, 7, 47, 97

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 5 x 5 x 7 x 47 x 97 = 25,530,400

This can also be written as 25 x 52 x 71 x 471 x 971 = 25,530,400

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


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