GCD of 661, 646, 390, 538 Calculator

Given Input numbers are 661, 646, 390, 538

To find the GCD of numbers using factoring list out all the divisors of each number

Divisors of 661

List of positive integer divisors of 661 that divides 661 without a remainder.

1, 661

Divisors of 646

List of positive integer divisors of 646 that divides 646 without a remainder.

1, 2, 17, 19, 34, 38, 323, 646

Divisors of 390

List of positive integer divisors of 390 that divides 390 without a remainder.

1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390

Divisors of 538

List of positive integer divisors of 538 that divides 538 without a remainder.

1, 2, 269, 538

Greatest Common Divisior

We found the divisors of 661, 646, 390, 538 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 661, 646, 390, 538 is 1.

Therefore, GCD of numbers 661, 646, 390, 538 is 1

Given Input Data is 661, 646, 390, 538

Make a list of Prime Factors of all the given numbers initially

Prime Factorization of 661 is 661

Prime Factorization of 646 is 2 x 17 x 19

Prime Factorization of 390 is 2 x 3 x 5 x 13

Prime Factorization of 538 is 2 x 269

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

Step1:

Let's calculate the GCD of first two numbers

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

LCM(661, 646) = 427006

GCD(661, 646) = ( 661 x 646 ) / 427006

GCD(661, 646) = 427006 / 427006

GCD(661, 646) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 390

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

LCM(1, 390) = 390

GCD(1, 390) = ( 1 x 390 ) / 390

GCD(1, 390) = 390 / 390

GCD(1, 390) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 538

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

LCM(1, 538) = 538

GCD(1, 538) = ( 1 x 538 ) / 538

GCD(1, 538) = 538 / 538

GCD(1, 538) = 1

GCD of 661, 646, 390, 538 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 560, 151, 256, 161
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• GCD of 569, 491, 276, 993

1. What is the GCD of 661, 646, 390, 538?

GCD of 661, 646, 390, 538 is 1

2. Where do I get the detailed procedure to find GCD of 661, 646, 390, 538?

You can find a detailed procedure to find GCD of 661, 646, 390, 538 on our page.

3. How to find GCD of 661, 646, 390, 538 on a calculator?

You can find the GCD of 661, 646, 390, 538 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.