216536568 has 32 divisors (see below), whose sum is σ = 543782400. Its totient is φ = 71853408.

The previous prime is 216536561. The next prime is 216536569. The reversal of 216536568 is 865635612.

It is a happy number.

216536568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216536561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14878 + ... + 25581.

It is an arithmetic number, because the mean of its divisors is an integer number (16993200).

Almost surely, 2^216536568 is an apocalyptic number.

It is an amenable number.

216536568 is an abundant number, since it is smaller than the sum of its proper divisors (327245832).

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

216536568 is a wasteful number, since it uses less digits than its factorization.

216536568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40691 (or 40687 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 216536568 is about 14715.1815483194. The cubic root of 216536568 is about 600.4964114018.

The spelling of 216536568 in words is "two hundred sixteen million, five hundred thirty-six thousand, five hundred sixty-eight".