Finite Group DatabasebetaFinite Group DatabasebetaOrder 648.
19 conjugacy classes of subgroups.
| # | subgroup | G/H | class size | multiplicity | normal? | properties |
|---|---|---|---|---|---|---|
| 1 | Q8×C27 | C3 | 1 | 1 | yes | maximal, characteristic |
| 2 | C2×C81 | — | 4 | 1 | no | maximal |
| 3 | C4×C27 | — | 3 | 1 | no | — |
| 4 | C81 | — | 4 | 1 | no | Sylow |
| 5 | Q8×C9 | C9 | 1 | 1 | yes | characteristic |
| 6 | C2×C27 | A4 | 1 | 1 | yes | characteristic |
| 7 | C4×C9 | — | 3 | 1 | no | — |
| 8 | C27 | SL(2,𝔽3) | 1 | 1 | yes | characteristic |
| 9 | C3×Q8 | C27 | 1 | 1 | yes | characteristic |
| 10 | C2×C9 | C22⋊C9 | 1 | 1 | yes | characteristic |
| 11 | C3×C4 | — | 3 | 1 | no | — |
| 12 | C9 | Q8⋊C9 | 1 | 1 | yes | characteristic |
| 13 | Q8 | C81 | 1 | 1 | yes | characteristic, complemented, Sylow |
| 14 | C2×C3 | C22⋊C27 | 1 | 1 | yes | characteristic |
| 15 | C4 | — | 3 | 1 | no | — |
| 16 | C3 | Q8⋊C27 | 1 | 1 | yes | characteristic |
| 17 | C2 | C22⋊C81 | 1 | 1 | yes | characteristic |
| subgroup | G/H | |
|---|---|---|
| center, Frattini, hypercenter | C2×C27 | A4 |
| commutator, hypocenter | Q8 | C81 |
| Fitting, cosocle | Q8×C27 | C3 |
| socle, prime radical | C2×C3 | C22⋊C27 |
| LCS | G ▷ Q8 | |
| UCS | C1 ◁ C2×C27 | |
Splittings G = N ⋊ H with N normal; H ≅ G/N.
| N | H ≅ G/N | type |
|---|---|---|
| 13. Q8 | C81 | semidirect |
By isomorphism type — maximal subgroups of the same type appear once, whether or not they are normal.
| subgroup | index |
|---|---|
| Q8×C27 | 3 |
| C2×C81 | 4 |