Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C25 · Schur multiplier (H2) = C28 |
No aliases for this group.
| Fitting | C2×C4×C5×D4 ⋊ C2 |
| Sylow | C5 ⋊ #3475 |
| subgroup | G/H | |
|---|---|---|
| center | C2×C4 | C23×D5 |
| commutator, socle, cosocle | C22×C5 | C25 |
| Frattini | C22 | C24×D5 |
| Fitting | C2×C4×C5×D4 | C2 |
| hypercenter | C2×C4×D4 | D5 |
| hypocenter | C5 | #3475 |
| LCS | G ▷ C22×C5 ▷ C5 | |
| UCS | C1 ◁ C2×C4 ◁ C2×C4×D4 | |
1132 conjugacy classes of subgroups.
| transitive degree | μt(G) = 160 |
Polycyclic presentation:
2^7,5|b^2=g,e^2=f,b^a=bf,c^a=cg,d^b=df,h^b=h^4130 conjugacy classes — view the full character table.
| maximal subgroup of | #11991334, #11991338, #12066164, … |
| maximal normal subgroup of | #11991334, #11991338, #12066164, … |
| maximal quotient of | #12258573, #12258686, D4×#4072, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 19747);