What is the Greatest Common Factor of 12855 and 12870?

Greatest common factor (GCF) of 12855 and 12870 is 15.

GCF(12855,12870) = 15

We will now calculate the prime factors of 12855 and 12870, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12855 and 12870.

How to find the GCF of 12855 and 12870?

We will first find the prime factorization of 12855 and 12870. After we will calculate the factors of 12855 and 12870 and find the biggest common factor number .

Step-1: Prime Factorization of 12855

Prime factors of 12855 are 3, 5, 857. Prime factorization of 12855 in exponential form is:

12855 = 3¹ × 5¹ × 857¹

Step-2: Prime Factorization of 12870

Prime factors of 12870 are 2, 3, 5, 11, 13. Prime factorization of 12870 in exponential form is:

12870 = 2¹ × 3² × 5¹ × 11¹ × 13¹

Step-3: Factors of 12855

List of positive integer factors of 12855 that divides 12855 without a remainder.

1, 3, 5, 15, 857, 2571, 4285

Step-4: Factors of 12870

List of positive integer factors of 12870 that divides 12855 without a remainder.

1, 2, 3, 5, 6, 9, 10, 11, 13, 15, 18, 22, 26, 30, 33, 39, 45, 55, 65, 66, 78, 90, 99, 110, 117, 130, 143, 165, 195, 198, 234, 286, 330, 390, 429, 495, 585, 715, 858, 990, 1170, 1287, 1430, 2145, 2574, 4290, 6435

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12855 and 12870. The biggest common factor number is the GCF number.
So the greatest common factor 12855 and 12870 is 15.

Also check out the Least Common Multiple of 12855 and 12870