216660204 has 48 divisors (see below), whose sum is σ = 569427040. Its totient is φ = 71228160.

The previous prime is 216660203. The next prime is 216660217. The reversal of 216660204 is 402066612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216660203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5857 + ... + 21624.

Almost surely, 2^216660204 is an apocalyptic number.

It is an amenable number.

216660204 is an abundant number, since it is smaller than the sum of its proper divisors (352766836).

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

216660204 is a wasteful number, since it uses less digits than its factorization.

216660204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27567 (or 27559 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 216660204 is about 14719.3819163714. The cubic root of 216660204 is about 600.6106782426.

The spelling of 216660204 in words is "two hundred sixteen million, six hundred sixty thousand, two hundred four".