Q: What is the prime factorization of the number 15,055,152?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 3 x 7 x 7 x 37 x 173
    • or also written as { 2, 2, 2, 2, 3, 7, 7, 37, 173 }
  • Written in exponential form: 24 x 31 x 72 x 371 x 1731

Why is the prime factorization of 15,055,152 written as 24 x 31 x 72 x 371 x 1731?

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 15,055,152

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 15,055,152 by 2

15,055,152 ÷ 2 = 7,527,576 - No remainder! 2 is one of the factors!
7,527,576 ÷ 2 = 3,763,788 - No remainder! 2 is one of the factors!
3,763,788 ÷ 2 = 1,881,894 - No remainder! 2 is one of the factors!
1,881,894 ÷ 2 = 940,947 - No remainder! 2 is one of the factors!
940,947 ÷ 2 = 470,473.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
940,947 ÷ 3 = 313,649 - No remainder! 3 is one of the factors!
313,649 ÷ 3 = 104,549.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
313,649 ÷ 5 = 62,729.8 - This has a remainder. 5 is not a factor.
313,649 ÷ 7 = 44,807 - No remainder! 7 is one of the factors!
44,807 ÷ 7 = 6,401 - No remainder! 7 is one of the factors!
6,401 ÷ 7 = 914.4286 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
6,401 ÷ 11 = 581.9091 - This has a remainder. 11 is not a factor.
6,401 ÷ 13 = 492.3846 - This has a remainder. 13 is not a factor.
6,401 ÷ 17 = 376.5294 - This has a remainder. 17 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
6,401 ÷ 37 = 173 - No remainder! 37 is one of the factors!
173 ÷ 37 = 4.6757 - There is a remainder. We can't divide by 37 evenly anymore. Let's try the next prime number
173 ÷ 41 = 4.2195 - This has a remainder. 41 is not a factor.
173 ÷ 43 = 4.0233 - This has a remainder. 43 is not a factor.
173 ÷ 47 = 3.6809 - This has a remainder. 47 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
173 ÷ 173 = 1 - No remainder! 173 is one of the factors!

The orange divisor(s) above are the prime factors of the number 15,055,152. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 3 x 7 x 7 x 37 x 173 = 15,055,152. It can also be written in exponential form as 24 x 31 x 72 x 371 x 1731.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 15,055,152.

15,055,152
Factor Arrows
27,527,576
Factor Arrows
23,763,788
Factor Arrows
21,881,894
Factor Arrows
2940,947
Factor Arrows
3313,649
Factor Arrows
744,807
Factor Arrows
76,401
Factor Arrows
37173

More Prime Factorization Examples

15,055,15015,055,15115,055,15315,055,154
21 x 52 x 111 x 311 x 8831891 x 169,15911511 x 1791 x 557121 x 7,527,5771

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