Q: What is the prime factorization of the number 85,033,859?

 A:
  • The prime factors are: 269 x 283 x 1,117
    • or also written as { 269, 283, 1,117 }
  • Written in exponential form: 2691 x 2831 x 1,1171

Why is the prime factorization of 85,033,859 written as 2691 x 2831 x 1,1171?

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 85,033,859

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 85,033,859 by 2

85,033,859 ÷ 2 = 42,516,929.5 - This has a remainder. Let's try another prime number.
85,033,859 ÷ 3 = 28,344,619.6667 - This has a remainder. Let's try another prime number.
85,033,859 ÷ 5 = 17,006,771.8 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
85,033,859 ÷ 269 = 316,111 - No remainder! 269 is one of the factors!
316,111 ÷ 269 = 1,175.1338 - There is a remainder. We can't divide by 269 evenly anymore. Let's try the next prime number
316,111 ÷ 271 = 1,166.4613 - This has a remainder. 271 is not a factor.
316,111 ÷ 277 = 1,141.1949 - This has a remainder. 277 is not a factor.
316,111 ÷ 281 = 1,124.9502 - This has a remainder. 281 is not a factor.
316,111 ÷ 283 = 1,117 - No remainder! 283 is one of the factors!
1,117 ÷ 283 = 3.947 - There is a remainder. We can't divide by 283 evenly anymore. Let's try the next prime number
1,117 ÷ 293 = 3.8123 - This has a remainder. 293 is not a factor.
1,117 ÷ 307 = 3.6384 - This has a remainder. 307 is not a factor.
1,117 ÷ 311 = 3.5916 - This has a remainder. 311 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,117 ÷ 1,117 = 1 - No remainder! 1,117 is one of the factors!

The orange divisor(s) above are the prime factors of the number 85,033,859. If we put all of it together we have the factors 269 x 283 x 1,117 = 85,033,859. It can also be written in exponential form as 2691 x 2831 x 1,1171.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 85,033,859.

85,033,859
Factor Arrows
269316,111
Factor Arrows
2831,117

More Prime Factorization Examples

85,033,85785,033,85885,033,86085,033,861
31 x 471 x 603,077121 x 71 x 131 x 291 x 16,111122 x 31 x 51 x 711 x 19,9611111 x 4391 x 17,6091

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