Q: What are the prime factors of the number 1,619,200?

 A: 2, 5, 11, 23

Why are those the prime factors of the number 1,619,200?

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 1,619,200

1,619,200
Factor Arrows
2809,600
Factor Arrows
2404,800
Factor Arrows
2202,400
Factor Arrows
2101,200
Factor Arrows
250,600
Factor Arrows
225,300
Factor Arrows
212,650
Factor Arrows
26,325
Factor Arrows
51,265
Factor Arrows
5253
Factor Arrows
1123

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, 11, 23

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 5 x 5 x 11 x 23 = 1,619,200

This can also be written as 28 x 52 x 111 x 231 = 1,619,200

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


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