Q: What is the prime factorization of the number 4,019,712?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 2,617
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2,617 }
  • Written in exponential form: 29 x 31 x 2,6171

Why is the prime factorization of 4,019,712 written as 29 x 31 x 2,6171?

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 4,019,712

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 4,019,712 by 2

4,019,712 ÷ 2 = 2,009,856 - No remainder! 2 is one of the factors!
2,009,856 ÷ 2 = 1,004,928 - No remainder! 2 is one of the factors!
1,004,928 ÷ 2 = 502,464 - No remainder! 2 is one of the factors!
502,464 ÷ 2 = 251,232 - No remainder! 2 is one of the factors!
251,232 ÷ 2 = 125,616 - No remainder! 2 is one of the factors!
125,616 ÷ 2 = 62,808 - No remainder! 2 is one of the factors!
62,808 ÷ 2 = 31,404 - No remainder! 2 is one of the factors!
31,404 ÷ 2 = 15,702 - No remainder! 2 is one of the factors!
15,702 ÷ 2 = 7,851 - No remainder! 2 is one of the factors!
7,851 ÷ 2 = 3,925.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
7,851 ÷ 3 = 2,617 - No remainder! 3 is one of the factors!
2,617 ÷ 3 = 872.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
2,617 ÷ 5 = 523.4 - This has a remainder. 5 is not a factor.
2,617 ÷ 7 = 373.8571 - This has a remainder. 7 is not a factor.
2,617 ÷ 11 = 237.9091 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,617 ÷ 2,617 = 1 - No remainder! 2,617 is one of the factors!

The orange divisor(s) above are the prime factors of the number 4,019,712. 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 2 x 3 x 2,617 = 4,019,712. It can also be written in exponential form as 29 x 31 x 2,6171.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 4,019,712.

4,019,712
Factor Arrows
22,009,856
Factor Arrows
21,004,928
Factor Arrows
2502,464
Factor Arrows
2251,232
Factor Arrows
2125,616
Factor Arrows
262,808
Factor Arrows
231,404
Factor Arrows
215,702
Factor Arrows
27,851
Factor Arrows
32,617

More Prime Factorization Examples

4,019,7104,019,7114,019,7134,019,714
21 x 51 x 231 x 17,47716411 x 6,27114,019,713121 x 2,009,8571

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