GCD of 780, 665, 647, 720 Calculator

Given Input numbers are 780, 665, 647, 720

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

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 665 :

The positive integer divisors of 665 that completely divides 665 are.

1, 5, 7, 19, 35, 95, 133, 665

Divisors of 647 :

The positive integer divisors of 647 that completely divides 647 are.

1, 647

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

GCD of numbers is the greatest common divisor

So, the GCD (780, 665, 647, 720) = 1.

Given numbers are 780, 665, 647, 720

The list of prime factors of all numbers are

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

Prime factors of 665 are 5 x 7 x 19

Prime factors of 647 are 647

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

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

Given numbers are 780, 665, 647, 720

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

Apply this formula for all numbers.

Step1:

LCM(780, 665) = 103740

GCD(780, 665) = ( 780 x 665 ) / 103740

= 780 / 665

= 780

Step2:

LCM(5, 647) = 3235

GCD(5, 647) = ( 5 x 647 ) / 3235

= 5 / 647

= 5

Step3:

LCM(1, 720) = 720

GCD(1, 720) = ( 1 x 720 ) / 720

= 1 / 720

= 1

So, Greatest Common Divisor of 780, 665, 647, 720 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 619, 557, 608, 770
• GCD of 979, 128, 323, 234
• GCD of 616, 995, 463, 708
• GCD of 618, 702, 279, 483
• GCD of 371, 383, 425, 112

Given numbers are 780, 665, 647, 720
The greatest common divisor of numbers 780, 665, 647, 720 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 780, 665, 647, 720 is 1.

1. What is the GCD of 780, 665, 647, 720?

GCD of given numbers 780, 665, 647, 720 is 1

2. How to calculate the greatest common divisor of 780, 665, 647, 720?

We can find the highest common divisor of 780, 665, 647, 720 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 780, 665, 647, 720 i.e 1.

3. How can I use the GCD of 780, 665, 647, 720Calculator?

Out the numbers 780, 665, 647, 720 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.