Q: What are the prime factors of the number 385,536?

 A: 2, 3, 251

Why are those the prime factors of the number 385,536?

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 385,536

385,536
Factor Arrows
2192,768
Factor Arrows
296,384
Factor Arrows
248,192
Factor Arrows
224,096
Factor Arrows
212,048
Factor Arrows
26,024
Factor Arrows
23,012
Factor Arrows
21,506
Factor Arrows
2753
Factor Arrows
3251

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, 251

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 251 = 385,536

This can also be written as 29 x 31 x 2511 = 385,536

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


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