What is the Least Common Multiple of 639 and 645?
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 639 and 645 is 137385.
LCM(639,645) = 137385
Least Common Multiple of 639 and 645 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 639 and 645, than apply into the LCM equation.
GCF(639,645) = 3
LCM(639,645) = ( 639 × 645) / 3
LCM(639,645) = 412155 / 3
LCM(639,645) = 137385
Least Common Multiple (LCM) of 639 and 645 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 639 and 645. First we will calculate the prime factors of 639 and 645.
Prime Factorization of 639
Prime factors of 639 are 3, 71. Prime factorization of 639 in exponential form is:
639 = 32 × 711
Prime Factorization of 645
Prime factors of 645 are 3, 5, 43. Prime factorization of 645 in exponential form is:
645 = 31 × 51 × 431
Now multiplying the highest exponent prime factors to calculate the LCM of 639 and 645.
LCM(639,645) = 32 × 711 × 51 × 431
LCM(639,645) = 137385
Related Least Common Multiples of 639
- LCM of 639 and 643
- LCM of 639 and 644
- LCM of 639 and 645
- LCM of 639 and 646
- LCM of 639 and 647
- LCM of 639 and 648
- LCM of 639 and 649
- LCM of 639 and 650
- LCM of 639 and 651
- LCM of 639 and 652
- LCM of 639 and 653
- LCM of 639 and 654
- LCM of 639 and 655
- LCM of 639 and 656
- LCM of 639 and 657
- LCM of 639 and 658
- LCM of 639 and 659
Related Least Common Multiples of 645
- LCM of 645 and 649
- LCM of 645 and 650
- LCM of 645 and 651
- LCM of 645 and 652
- LCM of 645 and 653
- LCM of 645 and 654
- LCM of 645 and 655
- LCM of 645 and 656
- LCM of 645 and 657
- LCM of 645 and 658
- LCM of 645 and 659
- LCM of 645 and 660
- LCM of 645 and 661
- LCM of 645 and 662
- LCM of 645 and 663
- LCM of 645 and 664
- LCM of 645 and 665