technically, for layman's purposes, Manus is right. It only has 1 side. There is nothing separating the sides from anything else. Technically, dice have infinite points on them, but nothing defies where on "side" begins and ends - there's just the external layer that is perfectly smooth and would be 1 side.

From a physic's perspective, the sphere has as many sides as it has atoms composing the outmost layer - and because that amount is dependent upon the sphere, if it is remotely capable of being seen with the naked eye, then we can, for clarity's sake, say it is infinite. But still, it's just ONE side. Those are just individual points upon that side.