What is the Least Common Multiple of 80640 and 80645?

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 80640 and 80645 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 80640 and 80645, than apply into the LCM equation.

GCF(80640,80645) = 5
LCM(80640,80645) = ( 80640 × 80645) / 5
LCM(80640,80645) = 6503212800 / 5
LCM(80640,80645) = 1300642560

Least Common Multiple (LCM) of 80640 and 80645 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 80640 and 80645. First we will calculate the prime factors of 80640 and 80645.

Prime Factorization of 80640

Prime Factorization of 80645

Now multiplying the highest exponent prime factors to calculate the LCM of 80640 and 80645.

LCM(80640,80645) = 2⁸ × 3² × 5¹ × 7¹ × 127²
LCM(80640,80645) = 1300642560