What is the Greatest Common Factor of 720 and 729?

Greatest common factor (GCF) of 720 and 729 is 9.

GCF(720,729) = 9

We will now calculate the prime factors of 720 and 729, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 720 and 729.

How to find the GCF of 720 and 729?

We will first find the prime factorization of 720 and 729. After we will calculate the factors of 720 and 729 and find the biggest common factor number .

Step-1: Prime Factorization of 720

Prime factors of 720 are 2, 3, 5. Prime factorization of 720 in exponential form is:

720 = 2⁴ × 3² × 5¹

Step-2: Prime Factorization of 729

Prime factors of 729 are 3. Prime factorization of 729 in exponential form is:

729 = 3⁶

Step-3: Factors of 720

List of positive integer factors of 720 that divides 720 without a remainder.

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360

Step-4: Factors of 729

List of positive integer factors of 729 that divides 720 without a remainder.

1, 3, 9, 27, 81, 243

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 720 and 729. The biggest common factor number is the GCF number.
So the greatest common factor 720 and 729 is 9.

Also check out the Least Common Multiple of 720 and 729