Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| nilpotency class | 1 |
| isoclinism | isoclinic class of C1 |
| automorphism | Aut(G) order 655399971717120 |
| homology | Abelianization (H1) = G · Schur multiplier (H2) = C221 |
| abelian | C27×C5 |
| subgroup | G/H | |
|---|---|---|
| center | G | C1 |
| commutator, Frattini | C1 | G |
| LCS | G ▷ C1 | |
| UCS | C1 ◁ G | |
58424 conjugacy classes of subgroups.
| minimal degree | μ(G) = 19 |
| transitive degree | μt(G) = 640 |
A minimal faithful permutation representation — 7 generators on 19 points:
(1,2)(15,16,17,18,19);(3,4);(5,6);(7,8);(9,10);(11,12);(13,14)640 conjugacy classes. The character table is too large to display.
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 21541);