216306616 has 8 divisors (see below), whose sum is σ = 405574920. Its totient is φ = 108153304.

The previous prime is 216306581. The next prime is 216306617. The reversal of 216306616 is 616603612.

216306616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×216306616³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216306617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13519156 + ... + 13519171.

It is an arithmetic number, because the mean of its divisors is an integer number (50696865).

Almost surely, 2^216306616 is an apocalyptic number.

It is an amenable number.

216306616 is a deficient number, since it is larger than the sum of its proper divisors (189268304).

216306616 is a wasteful number, since it uses less digits than its factorization.

216306616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27038333 (or 27038329 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 216306616 is about 14707.3660456249. The cubic root of 216306616 is about 600.2837694740.

The spelling of 216306616 in words is "two hundred sixteen million, three hundred six thousand, six hundred sixteen".