What is the Greatest Common Factor of 81865 and 81870?

Greatest common factor (GCF) of 81865 and 81870 is 5.

GCF(81865,81870) = 5

We will now calculate the prime factors of 81865 and 81870, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81865 and 81870.

How to find the GCF of 81865 and 81870?

We will first find the prime factorization of 81865 and 81870. After we will calculate the factors of 81865 and 81870 and find the biggest common factor number .

Step-1: Prime Factorization of 81865

Prime factors of 81865 are 5, 7, 2339. Prime factorization of 81865 in exponential form is:

81865 = 5¹ × 7¹ × 2339¹

Step-2: Prime Factorization of 81870

Prime factors of 81870 are 2, 3, 5, 2729. Prime factorization of 81870 in exponential form is:

81870 = 2¹ × 3¹ × 5¹ × 2729¹

Step-3: Factors of 81865

List of positive integer factors of 81865 that divides 81865 without a remainder.

1, 5, 7, 35, 2339, 11695, 16373

Step-4: Factors of 81870

List of positive integer factors of 81870 that divides 81865 without a remainder.

1, 2, 3, 5, 6, 10, 15, 30, 2729, 5458, 8187, 13645, 16374, 27290, 40935

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81865 and 81870. The biggest common factor number is the GCF number.
So the greatest common factor 81865 and 81870 is 5.

Also check out the Least Common Multiple of 81865 and 81870