216678771 has 24 divisors (see below), whose sum is σ = 326739504. Its totient is φ = 138231360.

The previous prime is 216678757. The next prime is 216678779. The reversal of 216678771 is 177876612.

216678771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216678771 - 2¹³ = 216670579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216678779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14980 + ... + 25646.

It is an arithmetic number, because the mean of its divisors is an integer number (13614146).

Almost surely, 2^216678771 is an apocalyptic number.

216678771 is a deficient number, since it is larger than the sum of its proper divisors (110060733).

216678771 is a wasteful number, since it uses less digits than its factorization.

216678771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771 (or 10768 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 216678771 is about 14720.0126018968. The cubic root of 216678771 is about 600.6278344773.

The spelling of 216678771 in words is "two hundred sixteen million, six hundred seventy-eight thousand, seven hundred seventy-one".