Back Ҳ. ҟ. 640 Abkhazian 640 ق م Arabic 640 ق م ARZ 640 e.C. AST E.ə. 640 Azerbaijani 640 г. пр.н.е. Bulgarian 640 v. Chr. German 640 BC English -640 Esperanto 640 eKr Estonian
| Blianta RC: 643 RC 642 RC 641 RC - 640 RC - 639 RC 638 RC 637 RC | |
| deichniúra: 670idí RC 660idí RC 650idí RC - 640idí RC - 630idí RC 620idí RC 610idí RC | |
| Aois: 8ú haois RC - 7ú haois RC - 6ú haois RC | |