216828388 has 12 divisors (see below), whose sum is σ = 433656832. Its totient is φ = 92926440.

The previous prime is 216828379. The next prime is 216828397. The reversal of 216828388 is 883828612.

It is a happy number.

216828388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216828379) and next prime (216828397).

216828388 is an admirable number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 3871908 + ... + 3871963.

Almost surely, 2^216828388 is an apocalyptic number.

216828388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216828388 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.

216828388 is a wasteful number, since it uses less digits than its factorization.

216828388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743882 (or 7743880 counting only the distinct ones).

The product of its digits is 294912, while the sum is 46.

The square root of 216828388 is about 14725.0938197351. The cubic root of 216828388 is about 600.7660474618.

The spelling of 216828388 in words is "two hundred sixteen million, eight hundred twenty-eight thousand, three hundred eighty-eight".