Really depends on the significance of the numbers. Ones that match actual zip codes tend to fetch higher prices... the more populous the city/the more well known, the higher the price. Post it in the following sub-section and see what people say: http://forums.digitalpoint.com/forumdisplay.php?f=61 ,
Only if you are lucky and this number is zip code or contact number or anything which is popular then you will get good amount for this domain else i dont think anyone will buy this domain beyond reg fee.