Q: What is the prime factorization of the number 24,118,528?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 7 x 43 x 313
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 7, 43, 313 }
  • Written in exponential form: 28 x 71 x 431 x 3131

Why is the prime factorization of 24,118,528 written as 28 x 71 x 431 x 3131?

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 24,118,528

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 24,118,528 by 2

24,118,528 ÷ 2 = 12,059,264 - No remainder! 2 is one of the factors!
12,059,264 ÷ 2 = 6,029,632 - No remainder! 2 is one of the factors!
6,029,632 ÷ 2 = 3,014,816 - No remainder! 2 is one of the factors!
3,014,816 ÷ 2 = 1,507,408 - No remainder! 2 is one of the factors!
1,507,408 ÷ 2 = 753,704 - No remainder! 2 is one of the factors!
753,704 ÷ 2 = 376,852 - No remainder! 2 is one of the factors!
376,852 ÷ 2 = 188,426 - No remainder! 2 is one of the factors!
188,426 ÷ 2 = 94,213 - No remainder! 2 is one of the factors!
94,213 ÷ 2 = 47,106.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
94,213 ÷ 3 = 31,404.3333 - This has a remainder. 3 is not a factor.
94,213 ÷ 5 = 18,842.6 - This has a remainder. 5 is not a factor.
94,213 ÷ 7 = 13,459 - No remainder! 7 is one of the factors!
13,459 ÷ 7 = 1,922.7143 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
13,459 ÷ 11 = 1,223.5455 - This has a remainder. 11 is not a factor.
13,459 ÷ 13 = 1,035.3077 - This has a remainder. 13 is not a factor.
13,459 ÷ 17 = 791.7059 - This has a remainder. 17 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
13,459 ÷ 43 = 313 - No remainder! 43 is one of the factors!
313 ÷ 43 = 7.2791 - There is a remainder. We can't divide by 43 evenly anymore. Let's try the next prime number
313 ÷ 47 = 6.6596 - This has a remainder. 47 is not a factor.
313 ÷ 53 = 5.9057 - This has a remainder. 53 is not a factor.
313 ÷ 59 = 5.3051 - This has a remainder. 59 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
313 ÷ 313 = 1 - No remainder! 313 is one of the factors!

The orange divisor(s) above are the prime factors of the number 24,118,528. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 7 x 43 x 313 = 24,118,528. It can also be written in exponential form as 28 x 71 x 431 x 3131.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 24,118,528.

24,118,528
Factor Arrows
212,059,264
Factor Arrows
26,029,632
Factor Arrows
23,014,816
Factor Arrows
21,507,408
Factor Arrows
2753,704
Factor Arrows
2376,852
Factor Arrows
2188,426
Factor Arrows
294,213
Factor Arrows
713,459
Factor Arrows
43313

More Prime Factorization Examples

24,118,52624,118,52724,118,52924,118,530
21 x 671 x 179,989131 x 311 x 259,3391171 x 2331 x 6,089121 x 31 x 51 x 6171 x 1,3031

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