218028 has 12 divisors (see below), whose sum is σ = 508760. Its totient is φ = 72672.

The previous prime is 218021. The next prime is 218047. The reversal of 218028 is 820812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 217995 and 218013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218021) by changing a digit.

218028 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, 9073 + ... + 9096.

2²¹⁸⁰²⁸ is an apocalyptic number.

It is an amenable number.

218028 is an abundant number, since it is smaller than the sum of its proper divisors (290732).

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

218028 is a wasteful number, since it uses less digits than its factorization.

218028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18176 (or 18174 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 218028 is about 466.9346849400. The cubic root of 218028 is about 60.1871931492.

The spelling of 218028 in words is "two hundred eighteen thousand, twenty-eight".