Q: What are the prime factors of the number 72,454,272?

 A: 2, 3, 11, 17, 1009

Why are those the prime factors of the number 72,454,272?

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 72,454,272

72,454,272
Factor Arrows
236,227,136
Factor Arrows
218,113,568
Factor Arrows
29,056,784
Factor Arrows
24,528,392
Factor Arrows
22,264,196
Factor Arrows
21,132,098
Factor Arrows
2566,049
Factor Arrows
3188,683
Factor Arrows
1117,153
Factor Arrows
171,009

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, 11, 17, 1009

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 11 x 17 x 1,009 = 72,454,272

This can also be written as 27 x 31 x 111 x 171 x 1,0091 = 72,454,272

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


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