216662604 has 12 divisors (see below), whose sum is σ = 505546104. Its totient is φ = 72220864.

The previous prime is 216662597. The next prime is 216662609. The reversal of 216662604 is 406266612.

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

It is not an unprimeable number, because it can be changed into a prime (216662609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9027597 + ... + 9027620.

It is an arithmetic number, because the mean of its divisors is an integer number (42128842).

Almost surely, 2^216662604 is an apocalyptic number.

It is an amenable number.

216662604 is an abundant number, since it is smaller than the sum of its proper divisors (288883500).

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

216662604 is a wasteful number, since it uses less digits than its factorization.

216662604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18055224 (or 18055222 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 216662604 is about 14719.4634413079. The cubic root of 216662604 is about 600.6128959400.

The spelling of 216662604 in words is "two hundred sixteen million, six hundred sixty-two thousand, six hundred four".