216891260 has 12 divisors (see below), whose sum is σ = 455471688. Its totient is φ = 86756496.

The previous prime is 216891209. The next prime is 216891281. The reversal of 216891260 is 62198612.

216891260 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216891260.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5422262 + ... + 5422301.

It is an arithmetic number, because the mean of its divisors is an integer number (37955974).

Almost surely, 2^216891260 is an apocalyptic number.

216891260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216891260 is an abundant number, since it is smaller than the sum of its proper divisors (238580428).

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

216891260 is a wasteful number, since it uses less digits than its factorization.

216891260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10844572 (or 10844570 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 216891260 is about 14727.2285240639. The cubic root of 216891260 is about 600.8241082984.

The spelling of 216891260 in words is "two hundred sixteen million, eight hundred ninety-one thousand, two hundred sixty".