Order 16448.
82 conjugacy classes of subgroups.
| subgroup | G/H | |
|---|---|---|
| center, socle | C2×C257 | C2×D8 |
| commutator, Frattini, cosocle | C8 | C23×C257 |
| prime radical | #135×C257 | C2 |
| LCS | G ▷ C8 ▷ C4 ▷ C2 ▷ C1 | |
| UCS | C1 ◁ C2×C257 ◁ C2×C4×C257 ◁ C2×C8×C257 ◁ G | |
Splittings G = N ⋊ H with N normal; H ≅ G/N.
| N | H ≅ G/N | type |
|---|---|---|
| 2. C2×Q16×C257 | C2 | semidirect |
| 3. Q32×C257 | C2 | semidirect |
| 4. SD32×C257 | C2 | semidirect |
| 5. M32×C257 | C2 | semidirect |
| 34. C257 | #510 | direct (N × H) |
| 35. #510 | C257 | direct (N × H) |
| 37. C2×Q16 | C2×C257 | semidirect |
| 38. Q32 | C2×C257 | semidirect |
| 39. SD32 | C2×C257 | semidirect |
| 40. M32 | C2×C257 | semidirect |
By isomorphism type — maximal subgroups of the same type appear once, whether or not they are normal.
| subgroup | index |
|---|---|
| #135×C257 | 2 |
| C2×Q16×C257 | 2 |
| Q32×C257 | 2 |
| SD32×C257 | 2 |
| M32×C257 | 2 |
| #510 | 257 |