216928 has 12 divisors (see below), whose sum is σ = 427140. Its totient is φ = 108448.

The previous prime is 216919. The next prime is 216947. The reversal of 216928 is 829612.

It is a happy number.

216928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216896 and 216905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3358 + ... + 3421.

It is an arithmetic number, because the mean of its divisors is an integer number (35595).

2²¹⁶⁹²⁸ is an apocalyptic number.

It is an amenable number.

216928 is a deficient number, since it is larger than the sum of its proper divisors (210212).

216928 is an equidigital number, since it uses as much as digits as its factorization.

216928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789 (or 6781 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 216928 is about 465.7553005603. The cubic root of 216928 is about 60.0858031644.

It can be divided in two parts, 2169 and 28, that added together give a cube (2197 = 13³).

The spelling of 216928 in words is "two hundred sixteen thousand, nine hundred twenty-eight".