216138164 has 24 divisors (see below), whose sum is σ = 423782688. Its totient is φ = 95588640.

The previous prime is 216138157. The next prime is 216138179. The reversal of 216138164 is 461831612.

216138164 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216138164.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 64754 + ... + 68009.

It is an arithmetic number, because the mean of its divisors is an integer number (17657612).

Almost surely, 2^216138164 is an apocalyptic number.

It is an amenable number.

216138164 is a deficient number, since it is larger than the sum of its proper divisors (207644524).

216138164 is a wasteful number, since it uses less digits than its factorization.

216138164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132815 (or 132813 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 216138164 is about 14701.6381400169. The cubic root of 216138164 is about 600.1279023627.

Adding to 216138164 its reverse (461831612), we get a palindrome (677969776).

The spelling of 216138164 in words is "two hundred sixteen million, one hundred thirty-eight thousand, one hundred sixty-four".