Q: What is the prime factorization of the number 57,036,672?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 7 x 11 x 643
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 3, 3, 7, 11, 643 }
  • Written in exponential form: 27 x 32 x 71 x 111 x 6431

Why is the prime factorization of 57,036,672 written as 27 x 32 x 71 x 111 x 6431?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 57,036,672

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 57,036,672 by 2

57,036,672 ÷ 2 = 28,518,336 - No remainder! 2 is one of the factors!
28,518,336 ÷ 2 = 14,259,168 - No remainder! 2 is one of the factors!
14,259,168 ÷ 2 = 7,129,584 - No remainder! 2 is one of the factors!
7,129,584 ÷ 2 = 3,564,792 - No remainder! 2 is one of the factors!
3,564,792 ÷ 2 = 1,782,396 - No remainder! 2 is one of the factors!
1,782,396 ÷ 2 = 891,198 - No remainder! 2 is one of the factors!
891,198 ÷ 2 = 445,599 - No remainder! 2 is one of the factors!
445,599 ÷ 2 = 222,799.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
445,599 ÷ 3 = 148,533 - No remainder! 3 is one of the factors!
148,533 ÷ 3 = 49,511 - No remainder! 3 is one of the factors!
49,511 ÷ 3 = 16,503.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
49,511 ÷ 5 = 9,902.2 - This has a remainder. 5 is not a factor.
49,511 ÷ 7 = 7,073 - No remainder! 7 is one of the factors!
7,073 ÷ 7 = 1,010.4286 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
7,073 ÷ 11 = 643 - No remainder! 11 is one of the factors!
643 ÷ 11 = 58.4545 - There is a remainder. We can't divide by 11 evenly anymore. Let's try the next prime number
643 ÷ 13 = 49.4615 - This has a remainder. 13 is not a factor.
643 ÷ 17 = 37.8235 - This has a remainder. 17 is not a factor.
643 ÷ 19 = 33.8421 - This has a remainder. 19 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
643 ÷ 643 = 1 - No remainder! 643 is one of the factors!

The orange divisor(s) above are the prime factors of the number 57,036,672. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 7 x 11 x 643 = 57,036,672. It can also be written in exponential form as 27 x 32 x 71 x 111 x 6431.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 57,036,672.

57,036,672
Factor Arrows
228,518,336
Factor Arrows
214,259,168
Factor Arrows
27,129,584
Factor Arrows
23,564,792
Factor Arrows
21,782,396
Factor Arrows
2891,198
Factor Arrows
2445,599
Factor Arrows
3148,533
Factor Arrows
349,511
Factor Arrows
77,073
Factor Arrows
11643

More Prime Factorization Examples

57,036,67057,036,67157,036,67357,036,674
21 x 51 x 191 x 300,19311071 x 533,053157,036,673121 x 28,518,3371

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