Upside-down number plate
While going through Shakuntala Devi's book on puzzles, I came across one which I liked very much. In fact, all the puzzles are good but I liked this particular one for the simple reason that it is the only one which I could solve - and that too after a lot of efforts.
Let me state it in my own way. I got to see a vehicle which bore a characteristic number. The number was characteristic because it could be read clearly upside down also.
The registration number consisted of five digits (all of them different). Thus, the number was a five-digit one. When the number plate was fixed upside down, the number could still be read very clearly (of course, the number now was a different one from the original). Thirdly, when the number plate was fixed upside down and the new number was read, the new number was greater than the original number by 78633. What is the actual number?