Q: What is the prime factorization of the number 378,245,737?

Why is the prime factorization of 378,245,737 written as 10,847¹ x 34,871¹?

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 378,245,737

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.

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 378,245,737 by 2

378,245,737 ÷ 2 = 189,122,868.5 - This has a remainder. Let's try another prime number.
378,245,737 ÷ 3 = 126,081,912.3333 - This has a remainder. Let's try another prime number.
378,245,737 ÷ 5 = 75,649,147.4 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
378,245,737 ÷ 10,847 = 34,871 - No remainder! 10,847 is one of the factors!
34,871 ÷ 10,847 = 3.2148 - There is a remainder. We can't divide by 10847 evenly anymore. Let's try the next prime number
34,871 ÷ 10,853 = 3.213 - This has a remainder. 10,853 is not a factor.
34,871 ÷ 10,859 = 3.2113 - This has a remainder. 10,859 is not a factor.
34,871 ÷ 10,861 = 3.2107 - This has a remainder. 10,861 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
34,871 ÷ 34,871 = 1 - No remainder! 34,871 is one of the factors!

The orange divisor(s) above are the prime factors of the number 378,245,737. If we put all of it together we have the factors 10,847 x 34,871 = 378,245,737. It can also be written in exponential form as 10,847¹ x 34,871¹.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 378,245,737.

	378,245,737
10,847		34,871

More Prime Factorization Examples

Try the factor calculator