Q: What is the prime factorization of the number 146,421,568?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 263 x 8,699
    • or also written as { 2, 2, 2, 2, 2, 2, 263, 8,699 }
  • Written in exponential form: 26 x 2631 x 8,6991

Why is the prime factorization of 146,421,568 written as 26 x 2631 x 8,6991?

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 146,421,568

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 146,421,568 by 2

146,421,568 ÷ 2 = 73,210,784 - No remainder! 2 is one of the factors!
73,210,784 ÷ 2 = 36,605,392 - No remainder! 2 is one of the factors!
36,605,392 ÷ 2 = 18,302,696 - No remainder! 2 is one of the factors!
18,302,696 ÷ 2 = 9,151,348 - No remainder! 2 is one of the factors!
9,151,348 ÷ 2 = 4,575,674 - No remainder! 2 is one of the factors!
4,575,674 ÷ 2 = 2,287,837 - No remainder! 2 is one of the factors!
2,287,837 ÷ 2 = 1,143,918.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
2,287,837 ÷ 3 = 762,612.3333 - This has a remainder. 3 is not a factor.
2,287,837 ÷ 5 = 457,567.4 - This has a remainder. 5 is not a factor.
2,287,837 ÷ 7 = 326,833.8571 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,287,837 ÷ 263 = 8,699 - No remainder! 263 is one of the factors!
8,699 ÷ 263 = 33.076 - There is a remainder. We can't divide by 263 evenly anymore. Let's try the next prime number
8,699 ÷ 269 = 32.3383 - This has a remainder. 269 is not a factor.
8,699 ÷ 271 = 32.0996 - This has a remainder. 271 is not a factor.
8,699 ÷ 277 = 31.4043 - This has a remainder. 277 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
8,699 ÷ 8,699 = 1 - No remainder! 8,699 is one of the factors!

The orange divisor(s) above are the prime factors of the number 146,421,568. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 263 x 8,699 = 146,421,568. It can also be written in exponential form as 26 x 2631 x 8,6991.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 146,421,568.

146,421,568
Factor Arrows
273,210,784
Factor Arrows
236,605,392
Factor Arrows
218,302,696
Factor Arrows
29,151,348
Factor Arrows
24,575,674
Factor Arrows
22,287,837
Factor Arrows
2638,699

More Prime Factorization Examples

146,421,566146,421,567146,421,569146,421,570
21 x 73,210,783133 x 5,423,021171 x 20,917,367121 x 31 x 51 x 4991 x 9,7811

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