216604 has 6 divisors (see below), whose sum is σ = 379064. Its totient is φ = 108300.

The previous prime is 216577. The next prime is 216607. The reversal of 216604 is 406612.

216604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27072 + ... + 27079.

2²¹⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

216604 is a deficient number, since it is larger than the sum of its proper divisors (162460).

216604 is a wasteful number, since it uses less digits than its factorization.

216604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54155 (or 54153 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 216604 is about 465.4073484594. The cubic root of 216604 is about 60.0558738783.

It can be divided in two parts, 216 and 604, that added together give a triangular number (820 = T₄₀).

The spelling of 216604 in words is "two hundred sixteen thousand, six hundred four".