Q: What is the prime factorization of the number 30,274,600?

 A:
  • The prime factors are: 2 x 2 x 2 x 5 x 5 x 19 x 31 x 257
    • or also written as { 2, 2, 2, 5, 5, 19, 31, 257 }
  • Written in exponential form: 23 x 52 x 191 x 311 x 2571

Why is the prime factorization of 30,274,600 written as 23 x 52 x 191 x 311 x 2571?

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 30,274,600

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 30,274,600 by 2

30,274,600 ÷ 2 = 15,137,300 - No remainder! 2 is one of the factors!
15,137,300 ÷ 2 = 7,568,650 - No remainder! 2 is one of the factors!
7,568,650 ÷ 2 = 3,784,325 - No remainder! 2 is one of the factors!
3,784,325 ÷ 2 = 1,892,162.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
3,784,325 ÷ 3 = 1,261,441.6667 - This has a remainder. 3 is not a factor.
3,784,325 ÷ 5 = 756,865 - No remainder! 5 is one of the factors!
756,865 ÷ 5 = 151,373 - No remainder! 5 is one of the factors!
151,373 ÷ 5 = 30,274.6 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
151,373 ÷ 7 = 21,624.7143 - This has a remainder. 7 is not a factor.
151,373 ÷ 11 = 13,761.1818 - This has a remainder. 11 is not a factor.
151,373 ÷ 13 = 11,644.0769 - This has a remainder. 13 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
151,373 ÷ 19 = 7,967 - No remainder! 19 is one of the factors!
7,967 ÷ 19 = 419.3158 - There is a remainder. We can't divide by 19 evenly anymore. Let's try the next prime number
7,967 ÷ 23 = 346.3913 - This has a remainder. 23 is not a factor.
7,967 ÷ 29 = 274.7241 - This has a remainder. 29 is not a factor.
7,967 ÷ 31 = 257 - No remainder! 31 is one of the factors!
257 ÷ 31 = 8.2903 - There is a remainder. We can't divide by 31 evenly anymore. Let's try the next prime number
257 ÷ 37 = 6.9459 - This has a remainder. 37 is not a factor.
257 ÷ 41 = 6.2683 - This has a remainder. 41 is not a factor.
257 ÷ 43 = 5.9767 - This has a remainder. 43 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
257 ÷ 257 = 1 - No remainder! 257 is one of the factors!

The orange divisor(s) above are the prime factors of the number 30,274,600. If we put all of it together we have the factors 2 x 2 x 2 x 5 x 5 x 19 x 31 x 257 = 30,274,600. It can also be written in exponential form as 23 x 52 x 191 x 311 x 2571.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 30,274,600.

30,274,600
Factor Arrows
215,137,300
Factor Arrows
27,568,650
Factor Arrows
23,784,325
Factor Arrows
5756,865
Factor Arrows
5151,373
Factor Arrows
197,967
Factor Arrows
31257

More Prime Factorization Examples

30,274,59830,274,59930,274,60130,274,602
21 x 15,137,299131 x 10,091,533172 x 231 x 26,863121 x 31 x 1,4811 x 3,4071

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