The complement of this graph is a rank-3 $\mathrm{SRG}(496,240,120,112)$.
| Number of vertices: | $496$ |
| Diameter: | $2$ |
| Intersection array: | $\{255,128;1,136\}$ |
| Spectrum: | $255^1 7^{340} (-17)^{155}$ |
| Automorphism group: | $\mathrm{PSO}^+(10,2) \cong \mathrm{O}_{10}^+(2):2$ |
| Distance-transitive: | Yes |
| Primitive |