What is the Greatest Common Factor of 27991 and 28009?

Greatest common factor (GCF) of 27991 and 28009 is 1.

GCF(27991,28009) = 1

We will now calculate the prime factors of 27991 and 28009, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 27991 and 28009.

How to find the GCF of 27991 and 28009?

We will first find the prime factorization of 27991 and 28009. After we will calculate the factors of 27991 and 28009 and find the biggest common factor number .

Step-1: Prime Factorization of 27991

Prime factors of 27991 are 23, 1217. Prime factorization of 27991 in exponential form is:

27991 = 23¹ × 1217¹

Step-2: Prime Factorization of 28009

Prime factors of 28009 are 37, 757. Prime factorization of 28009 in exponential form is:

28009 = 37¹ × 757¹

Step-3: Factors of 27991

List of positive integer factors of 27991 that divides 27991 without a remainder.

1, 23, 1217

Step-4: Factors of 28009

List of positive integer factors of 28009 that divides 27991 without a remainder.

1, 37, 757

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 27991 and 28009. The biggest common factor number is the GCF number.
So the greatest common factor 27991 and 28009 is 1.

Also check out the Least Common Multiple of 27991 and 28009