18028733 has 4 divisors (see below), whose sum is σ = 18324348. Its totient is φ = 17733120.

The previous prime is 18028729. The next prime is 18028753. The reversal of 18028733 is 33782081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2244004 + 15784729 = 1498^2 + 3973^2 .

It is a cyclic number.

It is not a de Polignac number, because 18028733 - 2² = 18028729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18028733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028723) 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, 147716 + ... + 147837.

It is an arithmetic number, because the mean of its divisors is an integer number (4581087).

Almost surely, 2^18028733 is an apocalyptic number.

It is an amenable number.

18028733 is a deficient number, since it is larger than the sum of its proper divisors (295615).

18028733 is an equidigital number, since it uses as much as digits as its factorization.

18028733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295614.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 18028733 is about 4246.0255533852. The cubic root of 18028733 is about 262.2135129958.

The spelling of 18028733 in words is "eighteen million, twenty-eight thousand, seven hundred thirty-three".