Q: What are the prime factors of the number 39,623,680?

 A: 2, 5, 71, 109

Why are those the prime factors of the number 39,623,680?

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 39,623,680

39,623,680
Factor Arrows
219,811,840
Factor Arrows
29,905,920
Factor Arrows
24,952,960
Factor Arrows
22,476,480
Factor Arrows
21,238,240
Factor Arrows
2619,120
Factor Arrows
2309,560
Factor Arrows
2154,780
Factor Arrows
277,390
Factor Arrows
238,695
Factor Arrows
57,739
Factor Arrows
71109

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, 109

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 2 x 5 x 71 x 109 = 39,623,680

This can also be written as 210 x 51 x 711 x 1091 = 39,623,680

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


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