What is the Greatest Common Factor of 81781 and 81788?

Greatest common factor (GCF) of 81781 and 81788 is 7.

GCF(81781,81788) = 7

We will now calculate the prime factors of 81781 and 81788, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81781 and 81788.

How to find the GCF of 81781 and 81788?

We will first find the prime factorization of 81781 and 81788. After we will calculate the factors of 81781 and 81788 and find the biggest common factor number .

Step-1: Prime Factorization of 81781

Prime factors of 81781 are 7, 1669. Prime factorization of 81781 in exponential form is:

81781 = 7² × 1669¹

Step-2: Prime Factorization of 81788

Prime factors of 81788 are 2, 7, 23, 127. Prime factorization of 81788 in exponential form is:

81788 = 2² × 7¹ × 23¹ × 127¹

Step-3: Factors of 81781

List of positive integer factors of 81781 that divides 81781 without a remainder.

1, 7, 49, 1669, 11683

Step-4: Factors of 81788

List of positive integer factors of 81788 that divides 81781 without a remainder.

1, 2, 4, 7, 14, 23, 28, 46, 92, 127, 161, 254, 322, 508, 644, 889, 1778, 2921, 3556, 5842, 11684, 20447, 40894

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81781 and 81788. The biggest common factor number is the GCF number.
So the greatest common factor 81781 and 81788 is 7.

Also check out the Least Common Multiple of 81781 and 81788