216304 has 20 divisors (see below), whose sum is σ = 457560. Its totient is φ = 98240.

The previous prime is 216289. The next prime is 216317. The reversal of 216304 is 403612.

216304 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439 + ... + 790.

It is an arithmetic number, because the mean of its divisors is an integer number (22878).

2²¹⁶³⁰⁴ is an apocalyptic number.

It is an amenable number.

216304 is an abundant number, since it is smaller than the sum of its proper divisors (241256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216304 is a wasteful number, since it uses less digits than its factorization.

216304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 216304 is about 465.0849384790. The cubic root of 216304 is about 60.0281349532.

Adding to 216304 its reverse (403612), we get a palindrome (619916).

The spelling of 216304 in words is "two hundred sixteen thousand, three hundred four".