216588 has 12 divisors (see below), whose sum is σ = 505400. Its totient is φ = 72192.

The previous prime is 216577. The next prime is 216607. The reversal of 216588 is 885612.

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

It is a plaindrome in base 13.

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216588.

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, 9013 + ... + 9036.

2²¹⁶⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

216588 is an abundant number, since it is smaller than the sum of its proper divisors (288812).

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

216588 is a wasteful number, since it uses less digits than its factorization.

216588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18056 (or 18054 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 216588 is about 465.3901588990. The cubic root of 216588 is about 60.0543951157.

The spelling of 216588 in words is "two hundred sixteen thousand, five hundred eighty-eight".