Q: What are the prime factors of the number 165,760?

 A: 2, 5, 7, 37

Why are those the prime factors of the number 165,760?

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 165,760

165,760
Factor Arrows
282,880
Factor Arrows
241,440
Factor Arrows
220,720
Factor Arrows
210,360
Factor Arrows
25,180
Factor Arrows
22,590
Factor Arrows
21,295
Factor Arrows
5259
Factor Arrows
737

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, 37

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 5 x 7 x 37 = 165,760

This can also be written as 27 x 51 x 71 x 371 = 165,760

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


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