28818533 has 4 divisors (see below), whose sum is σ = 28862028. Its totient is φ = 28775040.

The previous prime is 28818521. The next prime is 28818541. The reversal of 28818533 is 33581882.

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 4592449 + 24226084 = 2143^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 28818533 - 2¹² = 28814437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28818733) 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, 20738 + ... + 22083.

It is an arithmetic number, because the mean of its divisors is an integer number (7215507).

Almost surely, 2^28818533 is an apocalyptic number.

It is an amenable number.

28818533 is a deficient number, since it is larger than the sum of its proper divisors (43495).

28818533 is an equidigital number, since it uses as much as digits as its factorization.

28818533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43494.

The product of its digits is 46080, while the sum is 38.

The square root of 28818533 is about 5368.2895786274. The cubic root of 28818533 is about 306.5895089178.

The spelling of 28818533 in words is "twenty-eight million, eight hundred eighteen thousand, five hundred thirty-three".