216898864 has 80 divisors (see below), whose sum is σ = 519966720. Its totient is φ = 85351680.

The previous prime is 216898783. The next prime is 216898883. The reversal of 216898864 is 468898612.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 452577 + ... + 453055.

It is an arithmetic number, because the mean of its divisors is an integer number (6499584).

Almost surely, 2^216898864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216898864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259983360).

216898864 is an abundant number, since it is smaller than the sum of its proper divisors (303067856).

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

216898864 is a wasteful number, since it uses less digits than its factorization.

216898864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 812 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 52.

The square root of 216898864 is about 14727.4866830699. The cubic root of 216898864 is about 600.8311296557.

The spelling of 216898864 in words is "two hundred sixteen million, eight hundred ninety-eight thousand, eight hundred sixty-four".