What is the Greatest Common Factor of 7791 and 7809?

Greatest common factor (GCF) of 7791 and 7809 is 3.

GCF(7791,7809) = 3

We will now calculate the prime factors of 7791 and 7809, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7791 and 7809.

How to find the GCF of 7791 and 7809?

We will first find the prime factorization of 7791 and 7809. After we will calculate the factors of 7791 and 7809 and find the biggest common factor number .

Step-1: Prime Factorization of 7791

Prime factors of 7791 are 3, 7, 53. Prime factorization of 7791 in exponential form is:

7791 = 3¹ × 7² × 53¹

Step-2: Prime Factorization of 7809

Prime factors of 7809 are 3, 19, 137. Prime factorization of 7809 in exponential form is:

7809 = 3¹ × 19¹ × 137¹

Step-3: Factors of 7791

List of positive integer factors of 7791 that divides 7791 without a remainder.

1, 3, 7, 21, 49, 53, 147, 159, 371, 1113, 2597

Step-4: Factors of 7809

List of positive integer factors of 7809 that divides 7791 without a remainder.

1, 3, 19, 57, 137, 411, 2603

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7791 and 7809. The biggest common factor number is the GCF number.
So the greatest common factor 7791 and 7809 is 3.

Also check out the Least Common Multiple of 7791 and 7809