Q: What are the prime factors of the number 1,918,880?

 A: 2, 5, 67, 179

Why are those the prime factors of the number 1,918,880?

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 1,918,880

1,918,880
Factor Arrows
2959,440
Factor Arrows
2479,720
Factor Arrows
2239,860
Factor Arrows
2119,930
Factor Arrows
259,965
Factor Arrows
511,993
Factor Arrows
67179

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, 67, 179

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 5 x 67 x 179 = 1,918,880

This can also be written as 25 x 51 x 671 x 1791 = 1,918,880

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


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