What is the Least Common Multiple of 647 and 663?

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 647 and 663 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 647 and 663, than apply into the LCM equation.

GCF(647,663) = 1
LCM(647,663) = ( 647 × 663) / 1
LCM(647,663) = 428961 / 1
LCM(647,663) = 428961

Least Common Multiple (LCM) of 647 and 663 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 647 and 663. First we will calculate the prime factors of 647 and 663.

Prime Factorization of 647

Prime Factorization of 663

Now multiplying the highest exponent prime factors to calculate the LCM of 647 and 663.

LCM(647,663) = 647¹ × 3¹ × 13¹ × 17¹
LCM(647,663) = 428961