Q: What are the prime factors of the number 630,720?

 A: 2, 3, 5, 73

Why are those the prime factors of the number 630,720?

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 630,720

630,720
Factor Arrows
2315,360
Factor Arrows
2157,680
Factor Arrows
278,840
Factor Arrows
239,420
Factor Arrows
219,710
Factor Arrows
29,855
Factor Arrows
33,285
Factor Arrows
31,095
Factor Arrows
3365
Factor Arrows
573

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, 73

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 3 x 3 x 3 x 5 x 73 = 630,720

This can also be written as 26 x 33 x 51 x 731 = 630,720

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


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