216544 has 24 divisors (see below), whose sum is σ = 436968. Its totient is φ = 105600.

The previous prime is 216523. The next prime is 216551. The reversal of 216544 is 445612.

216544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

216544 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 in 3 ways as a sum of consecutive naturals, for example, 2094 + ... + 2194.

It is an arithmetic number, because the mean of its divisors is an integer number (18207).

2²¹⁶⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

216544 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216544 is a wasteful number, since it uses less digits than its factorization.

216544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 170 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 216544 is about 465.3428843337. The cubic root of 216544 is about 60.0503281432.

It can be divided in two parts, 2165 and 44, that added together give a square (2209 = 47²).

The spelling of 216544 in words is "two hundred sixteen thousand, five hundred forty-four".