[Keeper of Dol Guldur]

I have been reading, I have been doing a lot and I have just been reminded of something out of the past. The dwarves were given the seven rings. So there were Seven Dwarves that were very important. Seven is a number frequently associated with dwarves isn't it? I know we all say that when it comes to visions of dwarves Tolkien pretty much defined our view of them as greedy little hoard-mongers who will fight for their treasures, their homes and their dignity, but really didn't the Brothers Grimm? Snow White's dwarves were very much the same. A little poorer, but very much the same. I know Tolkien took from many, many other great tales to influence his mythology, but isn't the number 7 (besided fitting with the twenty rings perfectly) a little obvious?