Q: What is the prime factorization of the number 62,830,728?

 A:
  • The prime factors are: 2 x 2 x 2 x 3 x 3 x 3 x 3 x 47 x 2,063
    • or also written as { 2, 2, 2, 3, 3, 3, 3, 47, 2,063 }
  • Written in exponential form: 23 x 34 x 471 x 2,0631

Why is the prime factorization of 62,830,728 written as 23 x 34 x 471 x 2,0631?

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 62,830,728

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 62,830,728 by 2

62,830,728 ÷ 2 = 31,415,364 - No remainder! 2 is one of the factors!
31,415,364 ÷ 2 = 15,707,682 - No remainder! 2 is one of the factors!
15,707,682 ÷ 2 = 7,853,841 - No remainder! 2 is one of the factors!
7,853,841 ÷ 2 = 3,926,920.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
7,853,841 ÷ 3 = 2,617,947 - No remainder! 3 is one of the factors!
2,617,947 ÷ 3 = 872,649 - No remainder! 3 is one of the factors!
872,649 ÷ 3 = 290,883 - No remainder! 3 is one of the factors!
290,883 ÷ 3 = 96,961 - No remainder! 3 is one of the factors!
96,961 ÷ 3 = 32,320.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
96,961 ÷ 5 = 19,392.2 - This has a remainder. 5 is not a factor.
96,961 ÷ 7 = 13,851.5714 - This has a remainder. 7 is not a factor.
96,961 ÷ 11 = 8,814.6364 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
96,961 ÷ 47 = 2,063 - No remainder! 47 is one of the factors!
2,063 ÷ 47 = 43.8936 - There is a remainder. We can't divide by 47 evenly anymore. Let's try the next prime number
2,063 ÷ 53 = 38.9245 - This has a remainder. 53 is not a factor.
2,063 ÷ 59 = 34.9661 - This has a remainder. 59 is not a factor.
2,063 ÷ 61 = 33.8197 - This has a remainder. 61 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,063 ÷ 2,063 = 1 - No remainder! 2,063 is one of the factors!

The orange divisor(s) above are the prime factors of the number 62,830,728. If we put all of it together we have the factors 2 x 2 x 2 x 3 x 3 x 3 x 3 x 47 x 2,063 = 62,830,728. It can also be written in exponential form as 23 x 34 x 471 x 2,0631.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 62,830,728.

62,830,728
Factor Arrows
231,415,364
Factor Arrows
215,707,682
Factor Arrows
27,853,841
Factor Arrows
32,617,947
Factor Arrows
3872,649
Factor Arrows
3290,883
Factor Arrows
396,961
Factor Arrows
472,063

More Prime Factorization Examples

62,830,72662,830,72762,830,72962,830,730
21 x 71 x 4191 x 10,71111,1231 x 55,9491131 x 4,833,133121 x 51 x 2291 x 27,4371

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