216703866 has 8 divisors (see below), whose sum is σ = 433407744. Its totient is φ = 72234620.

The previous prime is 216703849. The next prime is 216703871. The reversal of 216703866 is 668307612.

It is a sphenic number, since it is the product of 3 distinct primes.

216703866 is an admirable number.

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, 18058650 + ... + 18058661.

It is an arithmetic number, because the mean of its divisors is an integer number (54175968).

Almost surely, 2^216703866 is an apocalyptic number.

216703866 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.

216703866 is a wasteful number, since it uses less digits than its factorization.

216703866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36117316.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 216703866 is about 14720.8649881724. The cubic root of 216703866 is about 600.6510211414.

The spelling of 216703866 in words is "two hundred sixteen million, seven hundred three thousand, eight hundred sixty-six".