What is the Greatest Common Factor of 81990 and 81999?

Greatest common factor (GCF) of 81990 and 81999 is 9.

GCF(81990,81999) = 9

We will now calculate the prime factors of 81990 and 81999, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81990 and 81999.

How to find the GCF of 81990 and 81999?

We will first find the prime factorization of 81990 and 81999. After we will calculate the factors of 81990 and 81999 and find the biggest common factor number .

Step-1: Prime Factorization of 81990

Prime factors of 81990 are 2, 3, 5, 911. Prime factorization of 81990 in exponential form is:

81990 = 2¹ × 3² × 5¹ × 911¹

Step-2: Prime Factorization of 81999

Prime factors of 81999 are 3, 3037. Prime factorization of 81999 in exponential form is:

81999 = 3³ × 3037¹

Step-3: Factors of 81990

List of positive integer factors of 81990 that divides 81990 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 911, 1822, 2733, 4555, 5466, 8199, 9110, 13665, 16398, 27330, 40995

Step-4: Factors of 81999

List of positive integer factors of 81999 that divides 81990 without a remainder.

1, 3, 9, 27, 3037, 9111, 27333

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81990 and 81999. The biggest common factor number is the GCF number.
So the greatest common factor 81990 and 81999 is 9.

Also check out the Least Common Multiple of 81990 and 81999