What is the Greatest Common Factor of 81915 and 81930?

Greatest common factor (GCF) of 81915 and 81930 is 15.

GCF(81915,81930) = 15

We will now calculate the prime factors of 81915 and 81930, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81915 and 81930.

How to find the GCF of 81915 and 81930?

We will first find the prime factorization of 81915 and 81930. After we will calculate the factors of 81915 and 81930 and find the biggest common factor number .

Step-1: Prime Factorization of 81915

Prime factors of 81915 are 3, 5, 43, 127. Prime factorization of 81915 in exponential form is:

81915 = 3¹ × 5¹ × 43¹ × 127¹

Step-2: Prime Factorization of 81930

Prime factors of 81930 are 2, 3, 5, 2731. Prime factorization of 81930 in exponential form is:

81930 = 2¹ × 3¹ × 5¹ × 2731¹

Step-3: Factors of 81915

List of positive integer factors of 81915 that divides 81915 without a remainder.

1, 3, 5, 15, 43, 127, 129, 215, 381, 635, 645, 1905, 5461, 16383, 27305

Step-4: Factors of 81930

List of positive integer factors of 81930 that divides 81915 without a remainder.

1, 2, 3, 5, 6, 10, 15, 30, 2731, 5462, 8193, 13655, 16386, 27310, 40965

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81915 and 81930. The biggest common factor number is the GCF number.
So the greatest common factor 81915 and 81930 is 15.

Also check out the Least Common Multiple of 81915 and 81930