What is the Least Common Multiple of 78240 and 78256?

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 of 78240 and 78256 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 78240 and 78256, than apply into the LCM equation.

GCF(78240,78256) = 16
LCM(78240,78256) = ( 78240 × 78256) / 16
LCM(78240,78256) = 6122749440 / 16
LCM(78240,78256) = 382671840

Least Common Multiple (LCM) of 78240 and 78256 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 78240 and 78256. First we will calculate the prime factors of 78240 and 78256.

Prime Factorization of 78240

Prime Factorization of 78256

Now multiplying the highest exponent prime factors to calculate the LCM of 78240 and 78256.

LCM(78240,78256) = 2⁵ × 3¹ × 5¹ × 163¹ × 67¹ × 73¹
LCM(78240,78256) = 382671840