Q: What is the prime factorization of the number 656,464?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 89 x 461
    • or also written as { 2, 2, 2, 2, 89, 461 }
  • Written in exponential form: 24 x 891 x 4611

Why is the prime factorization of 656,464 written as 24 x 891 x 4611?

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 656,464

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 656,464 by 2

656,464 ÷ 2 = 328,232 - No remainder! 2 is one of the factors!
328,232 ÷ 2 = 164,116 - No remainder! 2 is one of the factors!
164,116 ÷ 2 = 82,058 - No remainder! 2 is one of the factors!
82,058 ÷ 2 = 41,029 - No remainder! 2 is one of the factors!
41,029 ÷ 2 = 20,514.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
41,029 ÷ 3 = 13,676.3333 - This has a remainder. 3 is not a factor.
41,029 ÷ 5 = 8,205.8 - This has a remainder. 5 is not a factor.
41,029 ÷ 7 = 5,861.2857 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
41,029 ÷ 89 = 461 - No remainder! 89 is one of the factors!
461 ÷ 89 = 5.1798 - There is a remainder. We can't divide by 89 evenly anymore. Let's try the next prime number
461 ÷ 97 = 4.7526 - This has a remainder. 97 is not a factor.
461 ÷ 101 = 4.5644 - This has a remainder. 101 is not a factor.
461 ÷ 103 = 4.4757 - This has a remainder. 103 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
461 ÷ 461 = 1 - No remainder! 461 is one of the factors!

The orange divisor(s) above are the prime factors of the number 656,464. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 89 x 461 = 656,464. It can also be written in exponential form as 24 x 891 x 4611.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 656,464.

656,464
Factor Arrows
2328,232
Factor Arrows
2164,116
Factor Arrows
282,058
Factor Arrows
241,029
Factor Arrows
89461

More Prime Factorization Examples

656,462656,463656,465656,466
21 x 3831 x 857131 x 1271 x 1,723151 x 131,293121 x 31 x 231 x 671 x 711

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