18028533 has 16 divisors (see below), whose sum is σ = 24852096. Its totient is φ = 11618880.

The previous prime is 18028529. The next prime is 18028541. The reversal of 18028533 is 33582081.

It is a happy number.

It is not a de Polignac number, because 18028533 - 2² = 18028529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18028533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10491 + ... + 12087.

It is an arithmetic number, because the mean of its divisors is an integer number (1553256).

Almost surely, 2^18028533 is an apocalyptic number.

It is an amenable number.

18028533 is a deficient number, since it is larger than the sum of its proper divisors (6823563).

18028533 is a wasteful number, since it uses less digits than its factorization.

18028533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 18028533 is about 4246.0020018837. The cubic root of 18028533 is about 262.2125433789.

The spelling of 18028533 in words is "eighteen million, twenty-eight thousand, five hundred thirty-three".