What is the Least Common Multiple of 721 and 729?

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 721 and 729 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 721 and 729, than apply into the LCM equation.

GCF(721,729) = 1
LCM(721,729) = ( 721 × 729) / 1
LCM(721,729) = 525609 / 1
LCM(721,729) = 525609

Least Common Multiple (LCM) of 721 and 729 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 721 and 729. First we will calculate the prime factors of 721 and 729.

Prime Factorization of 721

Prime Factorization of 729

Now multiplying the highest exponent prime factors to calculate the LCM of 721 and 729.

LCM(721,729) = 7¹ × 103¹ × 3⁶
LCM(721,729) = 525609