Q: What is the prime factorization of the number 140,033,440?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 5 x 875,209
    • or also written as { 2, 2, 2, 2, 2, 5, 875,209 }
  • Written in exponential form: 25 x 51 x 875,2091

Why is the prime factorization of 140,033,440 written as 25 x 51 x 875,2091?

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 140,033,440

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 140,033,440 by 2

140,033,440 ÷ 2 = 70,016,720 - No remainder! 2 is one of the factors!
70,016,720 ÷ 2 = 35,008,360 - No remainder! 2 is one of the factors!
35,008,360 ÷ 2 = 17,504,180 - No remainder! 2 is one of the factors!
17,504,180 ÷ 2 = 8,752,090 - No remainder! 2 is one of the factors!
8,752,090 ÷ 2 = 4,376,045 - No remainder! 2 is one of the factors!
4,376,045 ÷ 2 = 2,188,022.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
4,376,045 ÷ 3 = 1,458,681.6667 - This has a remainder. 3 is not a factor.
4,376,045 ÷ 5 = 875,209 - No remainder! 5 is one of the factors!
875,209 ÷ 5 = 175,041.8 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
875,209 ÷ 7 = 125,029.8571 - This has a remainder. 7 is not a factor.
875,209 ÷ 11 = 79,564.4545 - This has a remainder. 11 is not a factor.
875,209 ÷ 13 = 67,323.7692 - This has a remainder. 13 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
875,209 ÷ 875,209 = 1 - No remainder! 875,209 is one of the factors!

The orange divisor(s) above are the prime factors of the number 140,033,440. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 5 x 875,209 = 140,033,440. It can also be written in exponential form as 25 x 51 x 875,2091.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 140,033,440.

140,033,440
Factor Arrows
270,016,720
Factor Arrows
235,008,360
Factor Arrows
217,504,180
Factor Arrows
28,752,090
Factor Arrows
24,376,045
Factor Arrows
5875,209

More Prime Factorization Examples

140,033,438140,033,439140,033,441140,033,442
21 x 70,016,719132 x 71 x 131 x 191 x 8,99914211 x 4871 x 683121 x 31 x 711 x 1131 x 2,9091

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