Q: What are the prime factors of the number 23,430,400?

 A: 2, 5, 7, 523

Why are those the prime factors of the number 23,430,400?

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 23,430,400

23,430,400
Factor Arrows
211,715,200
Factor Arrows
25,857,600
Factor Arrows
22,928,800
Factor Arrows
21,464,400
Factor Arrows
2732,200
Factor Arrows
2366,100
Factor Arrows
2183,050
Factor Arrows
291,525
Factor Arrows
518,305
Factor Arrows
53,661
Factor Arrows
7523

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, 523

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 7 x 523 = 23,430,400

This can also be written as 28 x 52 x 71 x 5231 = 23,430,400

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


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