Today the Reds Magic number is as follows:
38 vs. St. Louis
35 vs. San Diego
35 vs. Philadelphia
The Magic Number between a pair of teams is the number of your team's wins plus your opponent's Losses which will put your team ahead of that opponent at the end of the season. Any day that the Reds win or their main opponents lose, the magic number drops.
For the National League Central reace, THIS LINK will show the current magic numbers.
For the National League wild card race, THIS LINK will show the current magic numbers.