Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 3 |
| isoclinism | isoclinic class of #1665 |
| automorphism | ? |
| homology | Abelianization (H1) = C23×C5 · Schur multiplier (H2) = C2 |
| direct product | C5×#1672 |
| subgroup | G/H | |
|---|---|---|
| center, socle, prime radical | C22×C5 | #121 |
| commutator, Frattini, cosocle | C42 | C23×C5 |
| LCS | G ▷ C42 ▷ C22 ▷ C1 | |
| UCS | C1 ◁ C22×C5 ◁ C42×C5 ◁ G | |
150 conjugacy classes of subgroups; only the 72 normal subgroups are shown.
This group has 150 conjugacy classes of subgroups — too many to draw. Only its 72 normal subgroups are shown.
Dotted edges: containments with no intermediate normal subgroup — omitted non-normal subgroups may lie between.
| minimal degree | μ(G) = 29 |
| transitive degree | μt(G) = 640 |
A minimal faithful permutation representation — 3 generators on 29 points:
(1,2,3,4,5)(7,10)(8,12)(11,13)(14,15,18,21)(16,22,24,29)(17,25,27,20)(19,26,28,23);(6,7,8,10,9,11,12,13);(14,16,18,24)(15,19,21,28)(17,26,27,23)(20,29,25,22)145 conjugacy classes — view the full character table.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 5262);