Q: What are the prime factors of the number 69,440?

 A: 2, 5, 7, 31

Why are those the prime factors of the number 69,440?

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 69,440

69,440
Factor Arrows
234,720
Factor Arrows
217,360
Factor Arrows
28,680
Factor Arrows
24,340
Factor Arrows
22,170
Factor Arrows
21,085
Factor Arrows
5217
Factor Arrows
731

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, 7, 31

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 5 x 7 x 31 = 69,440

This can also be written as 26 x 51 x 71 x 311 = 69,440

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


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