216678814 has 32 divisors (see below), whose sum is σ = 373144320. Its totient is φ = 94181560.

The previous prime is 216678799. The next prime is 216678827. The reversal of 216678814 is 418876612.

216678814 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 15 ways as a sum of consecutive naturals, for example, 59457 + ... + 62995.

It is an arithmetic number, because the mean of its divisors is an integer number (11660760).

Almost surely, 2^216678814 is an apocalyptic number.

216678814 is a deficient number, since it is larger than the sum of its proper divisors (156465506).

216678814 is a wasteful number, since it uses less digits than its factorization.

216678814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597 (or 3575 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 216678814 is about 14720.0140624933. The cubic root of 216678814 is about 600.6278742089.

The spelling of 216678814 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred fourteen".