Finite Group DatabasebetaFinite Group Databasebeta| order | 640 |
| automorphism | ? |
| homology | Abelianization (H1) = C22 · Schur multiplier (H2) = C1 |
No aliases for this group.
| Sylow | C5 ⋊ SD128 |
| subgroup | G/H | |
|---|---|---|
| center | C2 | #64739 |
| commutator, cosocle | C5×C32 | C22 |
| Frattini | C32 | C2×D5 |
| Fitting, prime radical | C5×D32 | C2 |
| socle | C2×C5 | D32 |
| hypercenter | D32 | D5 |
| hypocenter | C5 | SD128 |
| LCS | G ▷ C5×C32 ▷ C5×C16 ▷ C5×C8 ▷ C4×C5 ▷ C2×C5 ▷ C5 | |
| UCS | C1 ◁ C2 ◁ C4 ◁ C8 ◁ C16 ◁ C32 ◁ D32 | |
38 conjugacy classes of subgroups.
| minimal degree | μ(G) = 69 |
| transitive degree | μt(G) = 320 |
Polycyclic presentation:
2^7,5|a^2=g,c^2=de,d^2=ef,e^2=fg,f^2=g,b^a=bc,c^a=cd,d^a=de,e^a=ef,f^a=fg,h^a=h^4,c^b=cd,d^b=de,e^b=ef,f^b=fg73 conjugacy classes — view the full character table.
| maximal subgroup of | D5×SD128, C2×#10598099, #12020351, … |
| maximal normal subgroup of | D5×SD128, C2×#10598099, #12020351, … |
| maximal quotient of | #11987178, #11987180, #11987201, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(640, 181);