GCF and LCM of 8
Every pair this site works through that contains 8. 24 of them share a factor with it; 9 share nothing, which is its own kind of answer.
Shares a factor with 8
Shares nothing with 8
What 8 is made of
Every common factor 8 can share with anything comes from this list, which is why the pairs below look the way they do. 8 = 2³, and that factorisation is unique — the fundamental theorem of arithmetic guarantees no other set of primes multiplies to it.
- Divisors (4)
- 1, 2, 4, 8
- As factor pairs
- 1×8, 2×4
- Prime factorisation
- 2³
- Divisors excluding itself add to
- 7 — deficient
Divisors come in pairs that multiply to 8, which is why there is an even number of them unless the number is a perfect square. The greatest common factor of 8 and any other number is the largest entry two lists like this one share.