What is the Greatest Common Factor of 81540 and 81558?

Greatest common factor (GCF) of 81540 and 81558 is 18.

GCF(81540,81558) = 18

We will now calculate the prime factors of 81540 and 81558, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81540 and 81558.

How to find the GCF of 81540 and 81558?

We will first find the prime factorization of 81540 and 81558. After we will calculate the factors of 81540 and 81558 and find the biggest common factor number .

Step-1: Prime Factorization of 81540

Prime factors of 81540 are 2, 3, 5, 151. Prime factorization of 81540 in exponential form is:

81540 = 2² × 3³ × 5¹ × 151¹

Step-2: Prime Factorization of 81558

Prime factors of 81558 are 2, 3, 23, 197. Prime factorization of 81558 in exponential form is:

81558 = 2¹ × 3² × 23¹ × 197¹

Step-3: Factors of 81540

List of positive integer factors of 81540 that divides 81540 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 90, 108, 135, 151, 180, 270, 302, 453, 540, 604, 755, 906, 1359, 1510, 1812, 2265, 2718, 3020, 4077, 4530, 5436, 6795, 8154, 9060, 13590, 16308, 20385, 27180, 40770

Step-4: Factors of 81558

List of positive integer factors of 81558 that divides 81540 without a remainder.

1, 2, 3, 6, 9, 18, 23, 46, 69, 138, 197, 207, 394, 414, 591, 1182, 1773, 3546, 4531, 9062, 13593, 27186, 40779

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81540 and 81558. The biggest common factor number is the GCF number.
So the greatest common factor 81540 and 81558 is 18.

Also check out the Least Common Multiple of 81540 and 81558