218928 has 20 divisors (see below), whose sum is σ = 565688. Its totient is φ = 72960.

The previous prime is 218923. The next prime is 218941. The reversal of 218928 is 829812.

218928 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 = 218895 and 218904.

It is not an unprimeable number, because it can be changed into a prime (218923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2233 + ... + 2328.

2²¹⁸⁹²⁸ is an apocalyptic number.

It is an amenable number.

218928 is an abundant number, since it is smaller than the sum of its proper divisors (346760).

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

218928 is a wasteful number, since it uses less digits than its factorization.

218928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572 (or 4566 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 218928 is about 467.8974246563. The cubic root of 218928 is about 60.2698952334.

The spelling of 218928 in words is "two hundred eighteen thousand, nine hundred twenty-eight".