The square root of 36 is 6.
It is a Jordan-Polya number, since it can be written as (3!)2.
36 is nontrivially palindromic in base 5, base 8 and base 11.
36 is an esthetic number in base 4 and base 5, because in such bases it adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (9).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is an Ulam number.
It is an alternating number because its digits alternate between odd and even.
It is a O'Halloran number.
It is a Duffinian number.
36 is an undulating number in base 5.
36 is a nontrivial repdigit in base 8 and base 11.
It is a plaindrome in base 8, base 10, base 11, base 13, base 14, base 15 and base 16.
It is a nialpdrome in base 3, base 4, base 6, base 7, base 8, base 9, base 11 and base 12.
It is a zygodrome in base 3, base 8 and base 11.
It is a panconsummate number.
36 is a highly composite number, because it has more divisors than any smaller number.
36 is a superabundant number, because it has a larger abundancy index than any smaller number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 36
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
36 is a wasteful number, since it uses less digits than its factorization.
36 is an evil number, because the sum of its binary digits is even.
The cubic root of 36 is about 3.3019272489.