# What is the Least Common Multiple of 128 and 139?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 128 and 139 is 17792.

LCM(128,139) = 17792

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## Least Common Multiple of 128 and 139 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 128 and 139, than apply into the LCM equation.

GCF(128,139) = 1
LCM(128,139) = ( 128 × 139) / 1
LCM(128,139) = 17792 / 1
LCM(128,139) = 17792

## Least Common Multiple (LCM) of 128 and 139 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 128 and 139. First we will calculate the prime factors of 128 and 139.

### Prime Factorization of 128

Prime factors of 128 are 2. Prime factorization of 128 in exponential form is:

128 = 27

### Prime Factorization of 139

Prime factors of 139 are 139. Prime factorization of 139 in exponential form is:

139 = 1391

Now multiplying the highest exponent prime factors to calculate the LCM of 128 and 139.

LCM(128,139) = 27 × 1391
LCM(128,139) = 17792