216909875 has 32 divisors (see below), whose sum is σ = 333191040. Its totient is φ = 137289600.

The previous prime is 216909859. The next prime is 216909893. The reversal of 216909875 is 578909612.

It is not a de Polignac number, because 216909875 - 2⁴ = 216909859 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1841 + ... + 20909.

It is an arithmetic number, because the mean of its divisors is an integer number (10412220).

Almost surely, 2^216909875 is an apocalyptic number.

216909875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216909875 is a deficient number, since it is larger than the sum of its proper divisors (116281165).

216909875 is a wasteful number, since it uses less digits than its factorization.

216909875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19104 (or 19094 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 216909875 is about 14727.8605031417. The cubic root of 216909875 is about 600.8412966670.

The spelling of 216909875 in words is "two hundred sixteen million, nine hundred nine thousand, eight hundred seventy-five".