What is the Least Common Multiple of 81628 and 81640?

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 81628 and 81640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 81628 and 81640, than apply into the LCM equation.

GCF(81628,81640) = 4
LCM(81628,81640) = ( 81628 × 81640) / 4
LCM(81628,81640) = 6664109920 / 4
LCM(81628,81640) = 1666027480

Least Common Multiple (LCM) of 81628 and 81640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 81628 and 81640. First we will calculate the prime factors of 81628 and 81640.

Prime Factorization of 81628

Prime Factorization of 81640

Now multiplying the highest exponent prime factors to calculate the LCM of 81628 and 81640.

LCM(81628,81640) = 2³ × 20407¹ × 5¹ × 13¹ × 157¹
LCM(81628,81640) = 1666027480