216268388 has 12 divisors (see below), whose sum is σ = 432536832. Its totient is φ = 92686440.

The previous prime is 216268361. The next prime is 216268411. The reversal of 216268388 is 883862612.

216268388 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

216268388 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3861908 + ... + 3861963.

It is an arithmetic number, because the mean of its divisors is an integer number (36044736).

Almost surely, 2^216268388 is an apocalyptic number.

216268388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216268388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216268388 is a wasteful number, since it uses less digits than its factorization.

216268388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7723882 (or 7723880 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 216268388 is about 14706.0663673193. The cubic root of 216268388 is about 600.2484045518.

The spelling of 216268388 in words is "two hundred sixteen million, two hundred sixty-eight thousand, three hundred eighty-eight".