Thirty Six or 36

36 = 1 + 3 + 5 + 7 + 9 + 11 (the sum of the first 6 odd numbers)

36 = (6)(6) - 6² =

36 = (3)(12) = (1²)(2²)(3²)

36 = (3)(12) = (72/2) = 3 dozen

36 is the square of the first Perfect Number.