GCD of 28, 161, 191, 390 Calculator

Given Input numbers are 28, 161, 191, 390

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

Divisors of 28

List of positive integer divisors of 28 that divides 28 without a remainder.

1, 2, 4, 7, 14, 28

Divisors of 161

List of positive integer divisors of 161 that divides 161 without a remainder.

1, 7, 23, 161

Divisors of 191

List of positive integer divisors of 191 that divides 191 without a remainder.

1, 191

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

Greatest Common Divisior

We found the divisors of 28, 161, 191, 390 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 28, 161, 191, 390 is 1.

Therefore, GCD of numbers 28, 161, 191, 390 is 1

Given Input Data is 28, 161, 191, 390

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

Prime Factorization of 28 is 2 x 2 x 7

Prime Factorization of 161 is 7 x 23

Prime Factorization of 191 is 191

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

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(28, 161) = 644

GCD(28, 161) = ( 28 x 161 ) / 644

GCD(28, 161) = 4508 / 644

GCD(28, 161) = 7

Step2:

Here we consider the GCD from the above i.e. 7 as first number and the next as 191

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

LCM(7, 191) = 1337

GCD(7, 191) = ( 7 x 191 ) / 1337

GCD(7, 191) = 1337 / 1337

GCD(7, 191) = 1

Step3:

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

GCD of 28, 161, 191, 390 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 42, 162, 418, 571
• GCD of 25, 149, 887, 514
• GCD of 86, 734, 558, 415
• GCD of 98, 833, 198, 602
• GCD of 78, 600, 620, 179

1. What is the GCD of 28, 161, 191, 390?

GCD of 28, 161, 191, 390 is 1

2. Where do I get the detailed procedure to find GCD of 28, 161, 191, 390?

You can find a detailed procedure to find GCD of 28, 161, 191, 390 on our page.

3. How to find GCD of 28, 161, 191, 390 on a calculator?

You can find the GCD of 28, 161, 191, 390 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.