216806233 has 24 divisors (see below), whose sum is σ = 262327680. Its totient is φ = 178446240.

The previous prime is 216806189. The next prime is 216806243. The reversal of 216806233 is 332608612.

It is a de Polignac number, because none of the positive numbers 2^k-216806233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216806195 and 216806204.

It is not an unprimeable number, because it can be changed into a prime (216806243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 384810 + ... + 385372.

It is an arithmetic number, because the mean of its divisors is an integer number (10930320).

Almost surely, 2^216806233 is an apocalyptic number.

It is an amenable number.

216806233 is a deficient number, since it is larger than the sum of its proper divisors (45521447).

216806233 is a wasteful number, since it uses less digits than its factorization.

216806233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 216806233 is about 14724.3415132902. The cubic root of 216806233 is about 600.7455851579.

The spelling of 216806233 in words is "two hundred sixteen million, eight hundred six thousand, two hundred thirty-three".