216668856 has 32 divisors (see below), whose sum is σ = 570182400. Its totient is φ = 68421600.

The previous prime is 216668839. The next prime is 216668899. The reversal of 216668856 is 658866612.

It is a happy number.

216668856 is nontrivially palindromic in base 7.

216668856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237120 + ... + 238031.

It is an arithmetic number, because the mean of its divisors is an integer number (17818200).

Almost surely, 2^216668856 is an apocalyptic number.

It is an amenable number.

216668856 is an abundant number, since it is smaller than the sum of its proper divisors (353513544).

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

216668856 is a wasteful number, since it uses less digits than its factorization.

216668856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475179 (or 475175 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 216668856 is about 14719.6758116475. The cubic root of 216668856 is about 600.6186729648.

The spelling of 216668856 in words is "two hundred sixteen million, six hundred sixty-eight thousand, eight hundred fifty-six".