Q: What are the prime factors of the number 11,540,480?

 A: 2, 5, 7, 23

Why are those the prime factors of the number 11,540,480?

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 11,540,480

11,540,480
Factor Arrows
25,770,240
Factor Arrows
22,885,120
Factor Arrows
21,442,560
Factor Arrows
2721,280
Factor Arrows
2360,640
Factor Arrows
2180,320
Factor Arrows
290,160
Factor Arrows
245,080
Factor Arrows
222,540
Factor Arrows
211,270
Factor Arrows
25,635
Factor Arrows
51,127
Factor Arrows
7161
Factor Arrows
723

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, 7, 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 2 x 2 x 2 x 5 x 7 x 7 x 23 = 11,540,480

This can also be written as 211 x 51 x 72 x 231 = 11,540,480

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


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