Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 2 |
| isoclinism | isoclinic class of #2403 |
| automorphism | ? |
| homology | Abelianization (H1) = C24×C5 · Schur multiplier (H2) = C22×C4 |
| direct product | C5×#2612 |
| subgroup | G/H | |
|---|---|---|
| center, socle, prime radical | C23×C5 | C24 |
| commutator, Frattini, cosocle | C23 | C24×C5 |
| LCS | G ▷ C23 ▷ C1 | |
| UCS | C1 ◁ C23×C5 ◁ G | |
388 conjugacy classes of subgroups.
| minimal degree | μ(G) = 29 |
| transitive degree | μt(G) = 640 |
A minimal faithful permutation representation — 4 generators on 29 points:
(1,2,3,4,5)(6,7)(8,12)(9,10)(11,13)(22,23,26,29)(24,28,25,27);(7,10)(11,12)(14,15,17,19)(16,18,20,21)(22,24,26,25)(23,27,29,28);(6,7)(8,11)(9,10)(12,13)(14,15)(16,18)(17,19)(20,21)(22,25,26,24)(23,28,29,27);(6,8,9,13)(7,11,10,12)(14,16,17,20)(15,18,19,21)(22,23)(24,27)(25,28)(26,29)190 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 18289);