216304404 has 12 divisors (see below), whose sum is σ = 504710304. Its totient is φ = 72101464.

The previous prime is 216304381. The next prime is 216304457. The reversal of 216304404 is 404403612.

It is a tau number, because it is divible by the number of its divisors (12).

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, 9012672 + ... + 9012695.

It is an arithmetic number, because the mean of its divisors is an integer number (42059192).

Almost surely, 2^216304404 is an apocalyptic number.

It is an amenable number.

216304404 is an abundant number, since it is smaller than the sum of its proper divisors (288405900).

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

216304404 is a wasteful number, since it uses less digits than its factorization.

216304404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18025374 (or 18025372 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 216304404 is about 14707.2908450197. The cubic root of 216304404 is about 600.2817232549.

The spelling of 216304404 in words is "two hundred sixteen million, three hundred four thousand, four hundred four".