What is the Least Common Multiple of 78715 and 78720?

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 78715 and 78720 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 78715 and 78720, than apply into the LCM equation.

GCF(78715,78720) = 5
LCM(78715,78720) = ( 78715 × 78720) / 5
LCM(78715,78720) = 6196444800 / 5
LCM(78715,78720) = 1239288960

Least Common Multiple (LCM) of 78715 and 78720 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 78715 and 78720. First we will calculate the prime factors of 78715 and 78720.

Prime Factorization of 78715

Prime Factorization of 78720

Now multiplying the highest exponent prime factors to calculate the LCM of 78715 and 78720.

LCM(78715,78720) = 5¹ × 7¹ × 13¹ × 173¹ × 2⁷ × 3¹ × 41¹
LCM(78715,78720) = 1239288960