Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C24×C4 · Schur multiplier (H2) = C29 |
| direct product | C4×#4147 |
| Fitting | C2×C4×C5×Q8 ⋊ C2 |
| Sylow | C5 ⋊ C4×2−1+4 |
1492 conjugacy classes of subgroups.
| transitive degree | μt(G) = 320 |
148 conjugacy classes — view the full character table.
| maximal subgroup of | #11990703, #11990706, #12065684, … |
| maximal normal subgroup of | #11990703, #11990706, #12065684, … |
| maximal quotient of | C4×#65838, C4×#65908, C4×#65906, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19776);