28018533 has 16 divisors (see below), whose sum is σ = 40400640. Its totient is φ = 17204736.

The previous prime is 28018519. The next prime is 28018537. The reversal of 28018533 is 33581082.

It is a happy number.

It is not a de Polignac number, because 28018533 - 2⁶ = 28018469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28018533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018537) 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, 3448 + ... + 8241.

It is an arithmetic number, because the mean of its divisors is an integer number (2525040).

Almost surely, 2^28018533 is an apocalyptic number.

It is an amenable number.

28018533 is a deficient number, since it is larger than the sum of its proper divisors (12382107).

28018533 is a wasteful number, since it uses less digits than its factorization.

28018533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11756.

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

The square root of 28018533 is about 5293.2535363423. The cubic root of 28018533 is about 303.7258789632.

The spelling of 28018533 in words is "twenty-eight million, eighteen thousand, five hundred thirty-three".