What is the Greatest Common Factor of 81907 and 81921?

Greatest common factor (GCF) of 81907 and 81921 is 7.

GCF(81907,81921) = 7

We will now calculate the prime factors of 81907 and 81921, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81907 and 81921.

How to find the GCF of 81907 and 81921?

We will first find the prime factorization of 81907 and 81921. After we will calculate the factors of 81907 and 81921 and find the biggest common factor number .

Step-1: Prime Factorization of 81907

Prime factors of 81907 are 7, 11701. Prime factorization of 81907 in exponential form is:

81907 = 7¹ × 11701¹

Step-2: Prime Factorization of 81921

Prime factors of 81921 are 3, 7, 47, 83. Prime factorization of 81921 in exponential form is:

81921 = 3¹ × 7¹ × 47¹ × 83¹

Step-3: Factors of 81907

List of positive integer factors of 81907 that divides 81907 without a remainder.

1, 7, 11701

Step-4: Factors of 81921

List of positive integer factors of 81921 that divides 81907 without a remainder.

1, 3, 7, 21, 47, 83, 141, 249, 329, 581, 987, 1743, 3901, 11703, 27307

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81907 and 81921. The biggest common factor number is the GCF number.
So the greatest common factor 81907 and 81921 is 7.

Also check out the Least Common Multiple of 81907 and 81921