216678889 has 16 divisors (see below), whose sum is σ = 263039616. Its totient is φ = 174240000.

The previous prime is 216678881. The next prime is 216678967. The reversal of 216678889 is 988876612.

216678889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 216678889 - 2³ = 216678881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216678881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36639 + ... + 42139.

It is an arithmetic number, because the mean of its divisors is an integer number (16439976).

Almost surely, 2^216678889 is an apocalyptic number.

It is an amenable number.

216678889 is a deficient number, since it is larger than the sum of its proper divisors (46360727).

216678889 is a wasteful number, since it uses less digits than its factorization.

216678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 2322432, while the sum is 55.

The square root of 216678889 is about 14720.0166100450. The cubic root of 216678889 is about 600.6279435082.

The spelling of 216678889 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred eighty-nine".