Q: What is the prime factorization of the number 774,240,220?

 A:
  • The prime factors are: 2 x 2 x 5 x 13 x 163 x 18,269
    • or also written as { 2, 2, 5, 13, 163, 18,269 }
  • Written in exponential form: 22 x 51 x 131 x 1631 x 18,2691

Why is the prime factorization of 774,240,220 written as 22 x 51 x 131 x 1631 x 18,2691?

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 774,240,220

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 774,240,220 by 2

774,240,220 ÷ 2 = 387,120,110 - No remainder! 2 is one of the factors!
387,120,110 ÷ 2 = 193,560,055 - No remainder! 2 is one of the factors!
193,560,055 ÷ 2 = 96,780,027.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
193,560,055 ÷ 3 = 64,520,018.3333 - This has a remainder. 3 is not a factor.
193,560,055 ÷ 5 = 38,712,011 - No remainder! 5 is one of the factors!
38,712,011 ÷ 5 = 7,742,402.2 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
38,712,011 ÷ 7 = 5,530,287.2857 - This has a remainder. 7 is not a factor.
38,712,011 ÷ 11 = 3,519,273.7273 - This has a remainder. 11 is not a factor.
38,712,011 ÷ 13 = 2,977,847 - No remainder! 13 is one of the factors!
2,977,847 ÷ 13 = 229,065.1538 - There is a remainder. We can't divide by 13 evenly anymore. Let's try the next prime number
2,977,847 ÷ 17 = 175,167.4706 - This has a remainder. 17 is not a factor.
2,977,847 ÷ 19 = 156,728.7895 - This has a remainder. 19 is not a factor.
2,977,847 ÷ 23 = 129,471.6087 - This has a remainder. 23 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,977,847 ÷ 163 = 18,269 - No remainder! 163 is one of the factors!
18,269 ÷ 163 = 112.0798 - There is a remainder. We can't divide by 163 evenly anymore. Let's try the next prime number
18,269 ÷ 167 = 109.3952 - This has a remainder. 167 is not a factor.
18,269 ÷ 173 = 105.6012 - This has a remainder. 173 is not a factor.
18,269 ÷ 179 = 102.0615 - This has a remainder. 179 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
18,269 ÷ 18,269 = 1 - No remainder! 18,269 is one of the factors!

The orange divisor(s) above are the prime factors of the number 774,240,220. If we put all of it together we have the factors 2 x 2 x 5 x 13 x 163 x 18,269 = 774,240,220. It can also be written in exponential form as 22 x 51 x 131 x 1631 x 18,2691.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 774,240,220.

774,240,220
Factor Arrows
2387,120,110
Factor Arrows
2193,560,055
Factor Arrows
538,712,011
Factor Arrows
132,977,847
Factor Arrows
16318,269

More Prime Factorization Examples

774,240,218774,240,219774,240,221774,240,222
21 x 531 x 6771 x 10,789132 x 3,1871 x 26,9931312 x 1731 x 4,657121 x 31 x 71 x 3591 x 51,3491

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