Q: What are the prime factors of the number 720,384?

 A: 2, 3, 7, 67

Why are those the prime factors of the number 720,384?

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 720,384

720,384
Factor Arrows
2360,192
Factor Arrows
2180,096
Factor Arrows
290,048
Factor Arrows
245,024
Factor Arrows
222,512
Factor Arrows
211,256
Factor Arrows
25,628
Factor Arrows
22,814
Factor Arrows
21,407
Factor Arrows
3469
Factor Arrows
767

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, 7, 67

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 3 x 7 x 67 = 720,384

This can also be written as 29 x 31 x 71 x 671 = 720,384

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


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