It is a tau number, because it is divible by the number of its divisors (8).
It is an Ulam number.
It is a plaindrome in base 9 and base 11.
It is a zygodrome in base 11.
It is a congruent number.
It is an unprimeable number.
16504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
216504 is an apocalyptic number.
It is an amenable number.
16504 is a wasteful number, since it uses less digits than its factorization.
16504 is an odious number, because the sum of its binary digits is odd.
The square root of 16504 is about 128.4678948220. The cubic root of 16504 is about 25.4602739117.
Subtracting from 16504 its product of nonzero digits (120), we obtain a 14-th power (16384 = 214).
The spelling of 16504 in words is "sixteen thousand, five hundred four".