216856 has 8 divisors (see below), whose sum is σ = 406620. Its totient is φ = 108424.

The previous prime is 216851. The next prime is 216859. The reversal of 216856 is 658612.

216856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216851) by changing a digit.

216856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13546 + ... + 13561.

2²¹⁶⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

216856 is a deficient number, since it is larger than the sum of its proper divisors (189764).

216856 is a wasteful number, since it uses less digits than its factorization.

216856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27113 (or 27109 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 216856 is about 465.6780003393. The cubic root of 216856 is about 60.0791547887.

The spelling of 216856 in words is "two hundred sixteen thousand, eight hundred fifty-six".