28808233 has 4 divisors (see below), whose sum is σ = 28999168. Its totient is φ = 28617300.

The previous prime is 28808189. The next prime is 28808243. The reversal of 28808233 is 33280882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28808233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28808243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95241 + ... + 95542.

It is an arithmetic number, because the mean of its divisors is an integer number (7249792).

Almost surely, 2^28808233 is an apocalyptic number.

It is an amenable number.

28808233 is a deficient number, since it is larger than the sum of its proper divisors (190935).

28808233 is a wasteful number, since it uses less digits than its factorization.

28808233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190934.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28808233 is about 5367.3301556733. The cubic root of 28808233 is about 306.5529786263.

The spelling of 28808233 in words is "twenty-eight million, eight hundred eight thousand, two hundred thirty-three".