216866860 has 24 divisors (see below), whose sum is σ = 520480800. Its totient is φ = 74354304.

The previous prime is 216866833. The next prime is 216866869. The reversal of 216866860 is 68668612.

216866860 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216866869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774385 + ... + 774664.

It is an arithmetic number, because the mean of its divisors is an integer number (21686700).

Almost surely, 2^216866860 is an apocalyptic number.

216866860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216866860 is an abundant number, since it is smaller than the sum of its proper divisors (303613940).

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

216866860 is a wasteful number, since it uses less digits than its factorization.

216866860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549065 (or 1549063 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 216866860 is about 14726.4001032160. The cubic root of 216866860 is about 600.8015767957.

The spelling of 216866860 in words is "two hundred sixteen million, eight hundred sixty-six thousand, eight hundred sixty".