Q: What are the prime factors of the number 78,064?

 A: 2, 7, 17, 41

Why are those the prime factors of the number 78,064?

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 78,064

78,064
Factor Arrows
239,032
Factor Arrows
219,516
Factor Arrows
29,758
Factor Arrows
24,879
Factor Arrows
7697
Factor Arrows
1741

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, 7, 17, 41

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 7 x 17 x 41 = 78,064

This can also be written as 24 x 71 x 171 x 411 = 78,064

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


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