Q: What are the prime factors of the number 169,216?

 A: 2, 661

Why are those the prime factors of the number 169,216?

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 169,216

169,216
Factor Arrows
284,608
Factor Arrows
242,304
Factor Arrows
221,152
Factor Arrows
210,576
Factor Arrows
25,288
Factor Arrows
22,644
Factor Arrows
21,322
Factor Arrows
2661

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, 661

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 661 = 169,216

This can also be written as 28 x 6611 = 169,216

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


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