Back Ҳ. ҟ. 638 Abkhazian 638 ق م Arabic 638 ق م ARZ 638 e.C. AST E.ə. 638 Azerbaijani 638 г. пр.н.е. Bulgarian 638 f.Kr. Danish 638 v. Chr. German 638 BC English 638 eKr Estonian
| Blianta RC: 641 RC 640 RC 639 RC - 638 RC - 637 RC 636 RC 635 RC | |
| deichniúra: 660idí RC 650idí RC 640idí RC - 630idí RC - 620idí RC 610idí RC 600idí RC | |
| Aois: 8ú haois RC - 7ú haois RC - 6ú haois RC | |