What is the Greatest Common Factor of 781 and 789?

Greatest common factor (GCF) of 781 and 789 is 1.

GCF(781,789) = 1

We will now calculate the prime factors of 781 and 789, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 781 and 789.

How to find the GCF of 781 and 789?

We will first find the prime factorization of 781 and 789. After we will calculate the factors of 781 and 789 and find the biggest common factor number .

Step-1: Prime Factorization of 781

Prime factors of 781 are 11, 71. Prime factorization of 781 in exponential form is:

781 = 11¹ × 71¹

Step-2: Prime Factorization of 789

Prime factors of 789 are 3, 263. Prime factorization of 789 in exponential form is:

789 = 3¹ × 263¹

Step-3: Factors of 781

List of positive integer factors of 781 that divides 781 without a remainder.

1, 11, 71

Step-4: Factors of 789

List of positive integer factors of 789 that divides 781 without a remainder.

1, 3, 263

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 781 and 789. The biggest common factor number is the GCF number.
So the greatest common factor 781 and 789 is 1.

Also check out the Least Common Multiple of 781 and 789