Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C25 · Schur multiplier (H2) = C28 |
| direct product | C2×#65999 |
| Fitting | C2×C5×#123 ⋊ C2 |
| Sylow | C5 ⋊ C2×#539 |
1144 conjugacy classes of subgroups.
| transitive degree | μt(G) = 320 |
100 conjugacy classes — view the full character table.
| maximal subgroup of | #12104659, #12109122, C4×#65999, … |
| maximal normal subgroup of | #12104659, #12109122, C4×#65999, … |
| maximal quotient of | C2×#10605785, C2×#10606394, C2×#10606114, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19978);