Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 2 |
| isoclinism | isoclinic class of D4 |
| automorphism | ? |
| homology | Abelianization (H1) = C24×C4×C5 · Schur multiplier (H2) = C210 |
| direct product | C23×C5×C4⋊C4 |
| subgroup | G/H | |
|---|---|---|
| center, socle, prime radical | C25×C5 | C22 |
| commutator | C2 | C24×C4×C5 |
| Frattini, cosocle | C22 | C25×C5 |
| LCS | G ▷ C2 ▷ C1 | |
| UCS | C1 ◁ C25×C5 ◁ G | |
2488 conjugacy classes of subgroups.
| minimal degree | μ(G) = 19 |
| transitive degree | μt(G) = 640 |
A minimal faithful permutation representation — 5 generators on 19 points:
(1,2)(15,16,17,18,19);(3,4);(5,6);(8,10)(11,12,13,14);(7,8,9,10)400 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 21287);