GCF and LCM Calculator Logo

What is the Least Common Multiple of 817 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 (LCM) of 817 and 821 is 670757.

LCM(817,821) = 670757

LCM Calculator and
and

Least Common Multiple of 817 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 817 and 821, than apply into the LCM equation.

GCF(817,821) = 1
LCM(817,821) = ( 817 × 821) / 1
LCM(817,821) = 670757 / 1
LCM(817,821) = 670757

Least Common Multiple (LCM) of 817 and 821 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 817 and 821. First we will calculate the prime factors of 817 and 821.

Prime Factorization of 817

Prime factors of 817 are 19, 43. Prime factorization of 817 in exponential form is:

817 = 191 × 431

Prime Factorization of 821

Prime factors of 821 are 821. Prime factorization of 821 in exponential form is:

821 = 8211

Now multiplying the highest exponent prime factors to calculate the LCM of 817 and 821.

LCM(817,821) = 191 × 431 × 8211
LCM(817,821) = 670757