What is the Greatest Common Factor of 71985 and 71991?

Greatest common factor (GCF) of 71985 and 71991 is 3.

GCF(71985,71991) = 3

We will now calculate the prime factors of 71985 and 71991, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 71985 and 71991.

How to find the GCF of 71985 and 71991?

We will first find the prime factorization of 71985 and 71991. After we will calculate the factors of 71985 and 71991 and find the biggest common factor number .

Step-1: Prime Factorization of 71985

Prime factors of 71985 are 3, 5, 4799. Prime factorization of 71985 in exponential form is:

71985 = 3¹ × 5¹ × 4799¹

Step-2: Prime Factorization of 71991

Prime factors of 71991 are 3, 19, 421. Prime factorization of 71991 in exponential form is:

71991 = 3² × 19¹ × 421¹

Step-3: Factors of 71985

List of positive integer factors of 71985 that divides 71985 without a remainder.

1, 3, 5, 15, 4799, 14397, 23995

Step-4: Factors of 71991

List of positive integer factors of 71991 that divides 71985 without a remainder.

1, 3, 9, 19, 57, 171, 421, 1263, 3789, 7999, 23997

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 71985 and 71991. The biggest common factor number is the GCF number.
So the greatest common factor 71985 and 71991 is 3.

Also check out the Least Common Multiple of 71985 and 71991