What is the Greatest Common Factor of 217 and 228?

Greatest common factor (GCF) of 217 and 228 is 1.

GCF(217,228) = 1

We will now calculate the prime factors of 217 and 228, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 217 and 228.

How to find the GCF of 217 and 228?

We will first find the prime factorization of 217 and 228. After we will calculate the factors of 217 and 228 and find the biggest common factor number .

Step-1: Prime Factorization of 217

Prime factors of 217 are 7, 31. Prime factorization of 217 in exponential form is:

217 = 7¹ × 31¹

Step-2: Prime Factorization of 228

Prime factors of 228 are 2, 3, 19. Prime factorization of 228 in exponential form is:

228 = 2² × 3¹ × 19¹

Step-3: Factors of 217

List of positive integer factors of 217 that divides 217 without a remainder.

1, 7, 31

Step-4: Factors of 228

List of positive integer factors of 228 that divides 217 without a remainder.

1, 2, 3, 4, 6, 12, 19, 38, 57, 76, 114

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 217 and 228. The biggest common factor number is the GCF number.
So the greatest common factor 217 and 228 is 1.

Also check out the Least Common Multiple of 217 and 228