216886728 has 16 divisors (see below), whose sum is σ = 542216880. Its totient is φ = 72295568.

The previous prime is 216886699. The next prime is 216886739. The reversal of 216886728 is 827688612.

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, 4518450 + ... + 4518497.

It is an arithmetic number, because the mean of its divisors is an integer number (33888555).

Almost surely, 2^216886728 is an apocalyptic number.

It is an amenable number.

216886728 is an abundant number, since it is smaller than the sum of its proper divisors (325330152).

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

216886728 is a wasteful number, since it uses less digits than its factorization.

216886728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036956 (or 9036952 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 216886728 is about 14727.0746586007. The cubic root of 216886728 is about 600.8199234765.

The spelling of 216886728 in words is "two hundred sixteen million, eight hundred eighty-six thousand, seven hundred twenty-eight".