Q: What is the prime factorization of the number 13,562,464?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 17 x 107 x 233
    • or also written as { 2, 2, 2, 2, 2, 17, 107, 233 }
  • Written in exponential form: 25 x 171 x 1071 x 2331

Why is the prime factorization of 13,562,464 written as 25 x 171 x 1071 x 2331?

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 13,562,464

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 13,562,464 by 2

13,562,464 ÷ 2 = 6,781,232 - No remainder! 2 is one of the factors!
6,781,232 ÷ 2 = 3,390,616 - No remainder! 2 is one of the factors!
3,390,616 ÷ 2 = 1,695,308 - No remainder! 2 is one of the factors!
1,695,308 ÷ 2 = 847,654 - No remainder! 2 is one of the factors!
847,654 ÷ 2 = 423,827 - No remainder! 2 is one of the factors!
423,827 ÷ 2 = 211,913.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
423,827 ÷ 3 = 141,275.6667 - This has a remainder. 3 is not a factor.
423,827 ÷ 5 = 84,765.4 - This has a remainder. 5 is not a factor.
423,827 ÷ 7 = 60,546.7143 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
423,827 ÷ 17 = 24,931 - No remainder! 17 is one of the factors!
24,931 ÷ 17 = 1,466.5294 - There is a remainder. We can't divide by 17 evenly anymore. Let's try the next prime number
24,931 ÷ 19 = 1,312.1579 - This has a remainder. 19 is not a factor.
24,931 ÷ 23 = 1,083.9565 - This has a remainder. 23 is not a factor.
24,931 ÷ 29 = 859.6897 - This has a remainder. 29 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
24,931 ÷ 107 = 233 - No remainder! 107 is one of the factors!
233 ÷ 107 = 2.1776 - There is a remainder. We can't divide by 107 evenly anymore. Let's try the next prime number
233 ÷ 109 = 2.1376 - This has a remainder. 109 is not a factor.
233 ÷ 113 = 2.0619 - This has a remainder. 113 is not a factor.
233 ÷ 127 = 1.8346 - This has a remainder. 127 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
233 ÷ 233 = 1 - No remainder! 233 is one of the factors!

The orange divisor(s) above are the prime factors of the number 13,562,464. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 17 x 107 x 233 = 13,562,464. It can also be written in exponential form as 25 x 171 x 1071 x 2331.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 13,562,464.

13,562,464
Factor Arrows
26,781,232
Factor Arrows
23,390,616
Factor Arrows
21,695,308
Factor Arrows
2847,654
Factor Arrows
2423,827
Factor Arrows
1724,931
Factor Arrows
107233

More Prime Factorization Examples

13,562,46213,562,46313,562,46513,562,466
21 x 6,781,231131 x 4871 x 9,283151 x 72 x 1971 x 281121 x 31 x 191 x 2711 x 4391

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