Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C25 · Schur multiplier (H2) = C28 |
| direct product | C2×#65893 |
| Fitting | C2×C4×C5×D4 ⋊ C2 |
| Sylow | C5 ⋊ C2×#559 |
1240 conjugacy classes of subgroups.
| transitive degree | μt(G) = 320 |
130 conjugacy classes — view the full character table.
| maximal subgroup of | #11990937, #12065627, #12065629, … |
| maximal normal subgroup of | #11990937, #12065627, #12065629, … |
| maximal quotient of | C2×#10605372, C2×#10605373, C2×#10605377, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19748);