There were 53 teams in the 1984 NCAA Men's Basketball Championship (5 play-in games before the tournament).
a lot of teams. In fact, about 100!
A total of 8 teams played in the 1939 NCAA basketball tournament. Oregon won the NCAA national championship that year.
There are currently 347 teams in NCAA Division 1 Basketball.
only one ,CONN. in 2004
Too many to enumerate, considering that only 35 schools have ever won a championship at all (through 2012).
Many too many to count.