216678018 has 16 divisors (see below), whose sum is σ = 437824800. Its totient is φ = 71481216.

The previous prime is 216678017. The next prime is 216678023. The reversal of 216678018 is 810876612.

216678018 is digitally balanced in base 2, 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 (216678017) 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, 185568 + ... + 186731.

It is an arithmetic number, because the mean of its divisors is an integer number (27364050).

Almost surely, 2^216678018 is an apocalyptic number.

216678018 is an abundant number, since it is smaller than the sum of its proper divisors (221146782).

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

216678018 is a wasteful number, since it uses less digits than its factorization.

216678018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372401.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 216678018 is about 14719.9870244508. The cubic root of 216678018 is about 600.6271387111.

The spelling of 216678018 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eighteen".