Q: What are the prime factors of the number 185,245,440?

 A: 2, 3, 5, 19, 2539

Why are those the prime factors of the number 185,245,440?

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 185,245,440

185,245,440
Factor Arrows
292,622,720
Factor Arrows
246,311,360
Factor Arrows
223,155,680
Factor Arrows
211,577,840
Factor Arrows
25,788,920
Factor Arrows
22,894,460
Factor Arrows
21,447,230
Factor Arrows
2723,615
Factor Arrows
3241,205
Factor Arrows
548,241
Factor Arrows
192,539

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, 5, 19, 2539

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 3 x 5 x 19 x 2,539 = 185,245,440

This can also be written as 28 x 31 x 51 x 191 x 2,5391 = 185,245,440

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


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