Q: What is the prime factorization of the number 416,723,736?

 A:
  • The prime factors are: 2 x 2 x 2 x 3 x 11 x 13 x 29 x 53 x 79
    • or also written as { 2, 2, 2, 3, 11, 13, 29, 53, 79 }
  • Written in exponential form: 23 x 31 x 111 x 131 x 291 x 531 x 791

Why is the prime factorization of 416,723,736 written as 23 x 31 x 111 x 131 x 291 x 531 x 791?

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 416,723,736

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 416,723,736 by 2

416,723,736 ÷ 2 = 208,361,868 - No remainder! 2 is one of the factors!
208,361,868 ÷ 2 = 104,180,934 - No remainder! 2 is one of the factors!
104,180,934 ÷ 2 = 52,090,467 - No remainder! 2 is one of the factors!
52,090,467 ÷ 2 = 26,045,233.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
52,090,467 ÷ 3 = 17,363,489 - No remainder! 3 is one of the factors!
17,363,489 ÷ 3 = 5,787,829.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
17,363,489 ÷ 5 = 3,472,697.8 - This has a remainder. 5 is not a factor.
17,363,489 ÷ 7 = 2,480,498.4286 - This has a remainder. 7 is not a factor.
17,363,489 ÷ 11 = 1,578,499 - No remainder! 11 is one of the factors!
1,578,499 ÷ 11 = 143,499.9091 - There is a remainder. We can't divide by 11 evenly anymore. Let's try the next prime number
1,578,499 ÷ 13 = 121,423 - No remainder! 13 is one of the factors!
121,423 ÷ 13 = 9,340.2308 - There is a remainder. We can't divide by 13 evenly anymore. Let's try the next prime number
121,423 ÷ 17 = 7,142.5294 - This has a remainder. 17 is not a factor.
121,423 ÷ 19 = 6,390.6842 - This has a remainder. 19 is not a factor.
121,423 ÷ 23 = 5,279.2609 - This has a remainder. 23 is not a factor.
121,423 ÷ 29 = 4,187 - No remainder! 29 is one of the factors!
4,187 ÷ 29 = 144.3793 - There is a remainder. We can't divide by 29 evenly anymore. Let's try the next prime number
4,187 ÷ 31 = 135.0645 - This has a remainder. 31 is not a factor.
4,187 ÷ 37 = 113.1622 - This has a remainder. 37 is not a factor.
4,187 ÷ 41 = 102.122 - This has a remainder. 41 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
4,187 ÷ 53 = 79 - No remainder! 53 is one of the factors!
79 ÷ 53 = 1.4906 - There is a remainder. We can't divide by 53 evenly anymore. Let's try the next prime number
79 ÷ 59 = 1.339 - This has a remainder. 59 is not a factor.
79 ÷ 61 = 1.2951 - This has a remainder. 61 is not a factor.
79 ÷ 67 = 1.1791 - This has a remainder. 67 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
79 ÷ 79 = 1 - No remainder! 79 is one of the factors!

The orange divisor(s) above are the prime factors of the number 416,723,736. If we put all of it together we have the factors 2 x 2 x 2 x 3 x 11 x 13 x 29 x 53 x 79 = 416,723,736. It can also be written in exponential form as 23 x 31 x 111 x 131 x 291 x 531 x 791.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 416,723,736.

416,723,736
Factor Arrows
2208,361,868
Factor Arrows
2104,180,934
Factor Arrows
252,090,467
Factor Arrows
317,363,489
Factor Arrows
111,578,499
Factor Arrows
13121,423
Factor Arrows
294,187
Factor Arrows
5379

More Prime Factorization Examples

416,723,734416,723,735416,723,737416,723,738
21 x 73 x 2111 x 2,879151 x 1,8671 x 44,6411171 x 971 x 252,713121 x 1,0931 x 190,6331

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