Q: What are the prime factors of the number 440,402,400?

 A: 2, 3, 5, 20389

Why are those the prime factors of the number 440,402,400?

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 440,402,400

440,402,400
Factor Arrows
2220,201,200
Factor Arrows
2110,100,600
Factor Arrows
255,050,300
Factor Arrows
227,525,150
Factor Arrows
213,762,575
Factor Arrows
34,587,525
Factor Arrows
31,529,175
Factor Arrows
3509,725
Factor Arrows
5101,945
Factor Arrows
520,389

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, 3, 5, 20389

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3 x 5 x 5 x 20,389 = 440,402,400

This can also be written as 25 x 33 x 52 x 20,3891 = 440,402,400

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


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