Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 3 |
| isoclinism | isoclinic class of #3264 |
| automorphism | ? |
| homology | Abelianization (H1) = C24×C5 · Schur multiplier (H2) = C24 |
| direct product | C5×#3390 |
| subgroup | G/H | |
|---|---|---|
| center, socle, prime radical | C22×C5 | C22×D4 |
| commutator, Frattini, cosocle | C2×C4 | C24×C5 |
| LCS | G ▷ C2×C4 ▷ C2 ▷ C1 | |
| UCS | C1 ◁ C22×C5 ◁ C4×C5×Q8 ◁ G | |
320 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)(6,7,10,9)(8,12,13,11)(14,15)(16,23)(17,21)(18,26)(19,22)(20,25)(24,29)(27,28);(6,8,10,13)(7,11,9,12)(16,24)(20,28)(23,29)(25,27);(14,16,19,24)(15,20,22,28)(17,25,18,27)(21,29,26,23);(6,9,10,7)(8,11,13,12)(14,17,19,18)(15,21,22,26)(16,25,24,27)(20,29,28,23)145 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19067);