GCD of 628, 720, 780, 391 Calculator

Given Input numbers are 628, 720, 780, 391

In the factoring method, we have to find the divisors of all numbers

Divisors of 628 :

The positive integer divisors of 628 that completely divides 628 are.

1, 2, 4, 157, 314, 628

Divisors of 720 :

The positive integer divisors of 720 that completely divides 720 are.

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, 720

Divisors of 780 :

The positive integer divisors of 780 that completely divides 780 are.

1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780

Divisors of 391 :

The positive integer divisors of 391 that completely divides 391 are.

1, 17, 23, 391

GCD of numbers is the greatest common divisor

So, the GCD (628, 720, 780, 391) = 1.

Given numbers are 628, 720, 780, 391

The list of prime factors of all numbers are

Prime factors of 628 are 2 x 2 x 157

Prime factors of 720 are 2 x 2 x 2 x 2 x 3 x 3 x 5

Prime factors of 780 are 2 x 2 x 3 x 5 x 13

Prime factors of 391 are 17 x 23

The above numbers do not have any common prime factor. So GCD is 1

Given numbers are 628, 720, 780, 391

GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)

Apply this formula for all numbers.

Step1:

LCM(628, 720) = 113040

GCD(628, 720) = ( 628 x 720 ) / 113040

= 628 / 720

= 628

Step2:

LCM(4, 780) = 780

GCD(4, 780) = ( 4 x 780 ) / 780

= 4 / 780

= 4

Step3:

LCM(4, 391) = 1564

GCD(4, 391) = ( 4 x 391 ) / 1564

= 4 / 391

= 4

So, Greatest Common Divisor of 628, 720, 780, 391 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 996, 776, 631, 710
• GCD of 909, 768, 701, 793
• GCD of 139, 607, 783, 959
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• GCD of 915, 714, 572, 367

Given numbers are 628, 720, 780, 391
The greatest common divisor of numbers 628, 720, 780, 391 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 628, 720, 780, 391 is 1.

1. What is the GCD of 628, 720, 780, 391?

GCD of given numbers 628, 720, 780, 391 is 1

2. How to calculate the greatest common divisor of 628, 720, 780, 391?

We can find the highest common divisor of 628, 720, 780, 391 easily using the prime factorization method. Just list the prime factors of all numbers and pick the highest common factor which is the GCD of 628, 720, 780, 391 i.e 1.

3. How can I use the GCD of 628, 720, 780, 391Calculator?

Out the numbers 628, 720, 780, 391 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.