Q: What is the prime factorization of the number 3,920,832?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3 x 2,269
    • or also written as { 2, 2, 2, 2, 2, 2, 3, 3, 3, 2,269 }
  • Written in exponential form: 26 x 33 x 2,2691

Why is the prime factorization of 3,920,832 written as 26 x 33 x 2,2691?

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 3,920,832

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 3,920,832 by 2

3,920,832 ÷ 2 = 1,960,416 - No remainder! 2 is one of the factors!
1,960,416 ÷ 2 = 980,208 - No remainder! 2 is one of the factors!
980,208 ÷ 2 = 490,104 - No remainder! 2 is one of the factors!
490,104 ÷ 2 = 245,052 - No remainder! 2 is one of the factors!
245,052 ÷ 2 = 122,526 - No remainder! 2 is one of the factors!
122,526 ÷ 2 = 61,263 - No remainder! 2 is one of the factors!
61,263 ÷ 2 = 30,631.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
61,263 ÷ 3 = 20,421 - No remainder! 3 is one of the factors!
20,421 ÷ 3 = 6,807 - No remainder! 3 is one of the factors!
6,807 ÷ 3 = 2,269 - No remainder! 3 is one of the factors!
2,269 ÷ 3 = 756.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
2,269 ÷ 5 = 453.8 - This has a remainder. 5 is not a factor.
2,269 ÷ 7 = 324.1429 - This has a remainder. 7 is not a factor.
2,269 ÷ 11 = 206.2727 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,269 ÷ 2,269 = 1 - No remainder! 2,269 is one of the factors!

The orange divisor(s) above are the prime factors of the number 3,920,832. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3 x 2,269 = 3,920,832. It can also be written in exponential form as 26 x 33 x 2,2691.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 3,920,832.

3,920,832
Factor Arrows
21,960,416
Factor Arrows
2980,208
Factor Arrows
2490,104
Factor Arrows
2245,052
Factor Arrows
2122,526
Factor Arrows
261,263
Factor Arrows
320,421
Factor Arrows
36,807
Factor Arrows
32,269

More Prime Factorization Examples

3,920,8303,920,8313,920,8333,920,834
21 x 51 x 411 x 731 x 13111,2971 x 3,023174 x 231 x 71121 x 471 x 531 x 7871

Try the factor calculator

Explore more about the number 3,920,832:


Ask a Question