• 172 can be written using four 4's:
172 is nontrivially palindromic in base 6.
172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a magnanimous number.
172 is a nontrivial repdigit in base 6.
It is a plaindrome in base 6, base 7, base 11, base 12 and base 16.
It is a nialpdrome in base 6, base 9, base 14 and base 15.
It is a zygodrome in base 6.
It is an amenable number.
172 is a wasteful number, since it uses less digits than its factorization.
172 is an evil number, because the sum of its binary digits is even.
The square root of 172 is about 13.1148770486. The cubic root of 172 is about 5.5612977665.
Subtracting 172 from its reverse (271), we obtain a palindrome (99).