How many dollar bills are there in 8000000?

There are some problems here. You need to specify 8 million what. Another problem is that there really are no dollar bills at all in 8 million anything, even 8 million dollars, unless you have accumulated that much cash in one dollar bills. No one in his right mind would accumulate that much money in one dollar bills unless it is for some kind of publicity stunt or Guiness record.