What is the Greatest Common Factor of 81978 and 81986?

Greatest common factor (GCF) of 81978 and 81986 is 2.

GCF(81978,81986) = 2

We will now calculate the prime factors of 81978 and 81986, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81978 and 81986.

How to find the GCF of 81978 and 81986?

We will first find the prime factorization of 81978 and 81986. After we will calculate the factors of 81978 and 81986 and find the biggest common factor number .

Step-1: Prime Factorization of 81978

Prime factors of 81978 are 2, 3, 13, 1051. Prime factorization of 81978 in exponential form is:

81978 = 2¹ × 3¹ × 13¹ × 1051¹

Step-2: Prime Factorization of 81986

Prime factors of 81986 are 2, 40993. Prime factorization of 81986 in exponential form is:

81986 = 2¹ × 40993¹

Step-3: Factors of 81978

List of positive integer factors of 81978 that divides 81978 without a remainder.

1, 2, 3, 6, 13, 26, 39, 78, 1051, 2102, 3153, 6306, 13663, 27326, 40989

Step-4: Factors of 81986

List of positive integer factors of 81986 that divides 81978 without a remainder.

1, 2, 40993

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81978 and 81986. The biggest common factor number is the GCF number.
So the greatest common factor 81978 and 81986 is 2.

Also check out the Least Common Multiple of 81978 and 81986