Q: What are the prime factors of the number 51,968?

 A: 2, 7, 29

Why are those the prime factors of the number 51,968?

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 51,968

51,968
Factor Arrows
225,984
Factor Arrows
212,992
Factor Arrows
26,496
Factor Arrows
23,248
Factor Arrows
21,624
Factor Arrows
2812
Factor Arrows
2406
Factor Arrows
2203
Factor Arrows
729

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, 29

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 7 x 29 = 51,968

This can also be written as 28 x 71 x 291 = 51,968

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


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