9^3

"The oligarch, again, is thrice removed from the king, and thus we get the formula 3 x 3, which is the number of a surface, representing the shadow which is the tyrant’s pleasure, and if you like to cube this ‘number of the beast,’ you will find that the measure of the difference amounts to 729; the king is 729 times more happy than the tyrant. And this extraordinary number is NEARLY equal to the number of days and nights in a year (365 x 2 = 730); and is therefore concerned with human life. This is the interval between a good and bad man in happiness only: what must be the difference between them in comeliness of life and virtue!"

From Book IX of The Republic, by Plato (Socrates can be a little tryte sometimes).