GCD of 398, 128, 428, 781 Calculator

Given Input numbers are 398, 128, 428, 781

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

Divisors of 398 :

The positive integer divisors of 398 that completely divides 398 are.

1, 2, 199, 398

Divisors of 128 :

The positive integer divisors of 128 that completely divides 128 are.

1, 2, 4, 8, 16, 32, 64, 128

Divisors of 428 :

The positive integer divisors of 428 that completely divides 428 are.

1, 2, 4, 107, 214, 428

Divisors of 781 :

The positive integer divisors of 781 that completely divides 781 are.

1, 11, 71, 781

GCD of numbers is the greatest common divisor

So, the GCD (398, 128, 428, 781) = 1.

Given numbers are 398, 128, 428, 781

The list of prime factors of all numbers are

Prime factors of 398 are 2 x 199

Prime factors of 128 are 2 x 2 x 2 x 2 x 2 x 2 x 2

Prime factors of 428 are 2 x 2 x 107

Prime factors of 781 are 11 x 71

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

Given numbers are 398, 128, 428, 781

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

Apply this formula for all numbers.

Step1:

LCM(398, 128) = 25472

GCD(398, 128) = ( 398 x 128 ) / 25472

= 398 / 128

= 398

Step2:

LCM(2, 428) = 428

GCD(2, 428) = ( 2 x 428 ) / 428

= 2 / 428

= 2

Step3:

LCM(2, 781) = 1562

GCD(2, 781) = ( 2 x 781 ) / 1562

= 2 / 781

= 2

So, Greatest Common Divisor of 398, 128, 428, 781 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 706, 576, 218, 582
• GCD of 241, 433, 369, 785
• GCD of 615, 448, 439, 327
• GCD of 598, 162, 372, 769
• GCD of 166, 685, 227, 446

Given numbers are 398, 128, 428, 781
The greatest common divisor of numbers 398, 128, 428, 781 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 398, 128, 428, 781 is 1.

1. What is the GCD of 398, 128, 428, 781?

GCD of given numbers 398, 128, 428, 781 is 1

2. How to calculate the greatest common divisor of 398, 128, 428, 781?

We can find the highest common divisor of 398, 128, 428, 781 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 398, 128, 428, 781 i.e 1.

3. How can I use the GCD of 398, 128, 428, 781Calculator?

Out the numbers 398, 128, 428, 781 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.