Q: What is the prime factorization of the number 1,602,816?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 2,087
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 3, 2,087 }
  • Written in exponential form: 28 x 31 x 2,0871

Why is the prime factorization of 1,602,816 written as 28 x 31 x 2,0871?

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 1,602,816

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 1,602,816 by 2

1,602,816 ÷ 2 = 801,408 - No remainder! 2 is one of the factors!
801,408 ÷ 2 = 400,704 - No remainder! 2 is one of the factors!
400,704 ÷ 2 = 200,352 - No remainder! 2 is one of the factors!
200,352 ÷ 2 = 100,176 - No remainder! 2 is one of the factors!
100,176 ÷ 2 = 50,088 - No remainder! 2 is one of the factors!
50,088 ÷ 2 = 25,044 - No remainder! 2 is one of the factors!
25,044 ÷ 2 = 12,522 - No remainder! 2 is one of the factors!
12,522 ÷ 2 = 6,261 - No remainder! 2 is one of the factors!
6,261 ÷ 2 = 3,130.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
6,261 ÷ 3 = 2,087 - No remainder! 3 is one of the factors!
2,087 ÷ 3 = 695.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
2,087 ÷ 5 = 417.4 - This has a remainder. 5 is not a factor.
2,087 ÷ 7 = 298.1429 - This has a remainder. 7 is not a factor.
2,087 ÷ 11 = 189.7273 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
2,087 ÷ 2,087 = 1 - No remainder! 2,087 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,602,816. 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 3 x 2,087 = 1,602,816. It can also be written in exponential form as 28 x 31 x 2,0871.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,602,816.

1,602,816
Factor Arrows
2801,408
Factor Arrows
2400,704
Factor Arrows
2200,352
Factor Arrows
2100,176
Factor Arrows
250,088
Factor Arrows
225,044
Factor Arrows
212,522
Factor Arrows
26,261
Factor Arrows
32,087

More Prime Factorization Examples

1,602,8141,602,8151,602,8171,602,818
21 x 801,407151 x 320,56311,602,817121 x 71 x 114,4871

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