209028 has 12 divisors (see below), whose sum is σ = 487760. Its totient is φ = 69672.

The previous prime is 209021. The next prime is 209029. The reversal of 209028 is 820902.

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

It is a junction number, because it is equal to n+sod(n) for n = 208995 and 209013.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 209028.

It is not an unprimeable number, because it can be changed into a prime (209021) by changing a digit.

209028 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, 8698 + ... + 8721.

2²⁰⁹⁰²⁸ is an apocalyptic number.

It is an amenable number.

209028 is an abundant number, since it is smaller than the sum of its proper divisors (278732).

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

209028 is a wasteful number, since it uses less digits than its factorization.

209028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17426 (or 17424 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 209028 is about 457.1958005056. The cubic root of 209028 is about 59.3473714487.

It can be divided in two parts, 20902 and 8, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 209028 in words is "two hundred nine thousand, twenty-eight".