28531028 has 24 divisors (see below), whose sum is σ = 50971200. Its totient is φ = 13970880.

The previous prime is 28530979. The next prime is 28531051. The reversal of 28531028 is 82013582.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57863 + ... + 58353.

It is an arithmetic number, because the mean of its divisors is an integer number (2123800).

Almost surely, 2^28531028 is an apocalyptic number.

It is an amenable number.

28531028 is a deficient number, since it is larger than the sum of its proper divisors (22440172).

28531028 is a wasteful number, since it uses less digits than its factorization.

28531028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28531028 is about 5341.4443739498. Note that the first 3 decimals coincide. The cubic root of 28531028 is about 305.5665470769.

It can be divided in two parts, 285 and 31028, that added together give a palindrome (31313).

The spelling of 28531028 in words is "twenty-eight million, five hundred thirty-one thousand, twenty-eight".