math.floor it :>
Or, better yet, make it equal to your size relative to all other objects; it could be a percentage. IE, you represent 10% of the total mass in play. The advantage of a percentage is that it never gets larger than 100%, so it doesn't take up a lot of screen space with numbers. :>
The most elegant method possible would be to make the game neverending; transparently changed, for example, size 1,000,000 objects to be size 1, in order to start over and avoid running out of digits. :> That would mean you could make the game never-ending..