What is the Greatest Common Factor of 987 and 993?

Greatest common factor (GCF) of 987 and 993 is 3.

GCF(987,993) = 3

We will now calculate the prime factors of 987 and 993, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 987 and 993.

How to find the GCF of 987 and 993?

We will first find the prime factorization of 987 and 993. After we will calculate the factors of 987 and 993 and find the biggest common factor number .

Step-1: Prime Factorization of 987

Prime factors of 987 are 3, 7, 47. Prime factorization of 987 in exponential form is:

987 = 3¹ × 7¹ × 47¹

Step-2: Prime Factorization of 993

Prime factors of 993 are 3, 331. Prime factorization of 993 in exponential form is:

993 = 3¹ × 331¹

Step-3: Factors of 987

List of positive integer factors of 987 that divides 987 without a remainder.

1, 3, 7, 21, 47, 141, 329

Step-4: Factors of 993

List of positive integer factors of 993 that divides 987 without a remainder.

1, 3, 331

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 987 and 993. The biggest common factor number is the GCF number.
So the greatest common factor 987 and 993 is 3.

Also check out the Least Common Multiple of 987 and 993