What is the Least Common Multiple of 809 and 821?

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 809 and 821 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 809 and 821, than apply into the LCM equation.

GCF(809,821) = 1
LCM(809,821) = ( 809 × 821) / 1
LCM(809,821) = 664189 / 1
LCM(809,821) = 664189

Least Common Multiple (LCM) of 809 and 821 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 809 and 821. First we will calculate the prime factors of 809 and 821.

Prime Factorization of 809

Prime Factorization of 821

Now multiplying the highest exponent prime factors to calculate the LCM of 809 and 821.

LCM(809,821) = 809¹ × 821¹
LCM(809,821) = 664189