What is the Greatest Common Factor of 1276 and 1287?

Greatest common factor (GCF) of 1276 and 1287 is 11.

GCF(1276,1287) = 11

We will now calculate the prime factors of 1276 and 1287, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1276 and 1287.

How to find the GCF of 1276 and 1287?

We will first find the prime factorization of 1276 and 1287. After we will calculate the factors of 1276 and 1287 and find the biggest common factor number .

Step-1: Prime Factorization of 1276

Prime factors of 1276 are 2, 11, 29. Prime factorization of 1276 in exponential form is:

1276 = 2² × 11¹ × 29¹

Step-2: Prime Factorization of 1287

Prime factors of 1287 are 3, 11, 13. Prime factorization of 1287 in exponential form is:

1287 = 3² × 11¹ × 13¹

Step-3: Factors of 1276

List of positive integer factors of 1276 that divides 1276 without a remainder.

1, 2, 4, 11, 22, 29, 44, 58, 116, 319, 638

Step-4: Factors of 1287

List of positive integer factors of 1287 that divides 1276 without a remainder.

1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1276 and 1287. The biggest common factor number is the GCF number.
So the greatest common factor 1276 and 1287 is 11.

Also check out the Least Common Multiple of 1276 and 1287