28543728 has 40 divisors (see below), whose sum is σ = 74995200. Its totient is φ = 9352384.

The previous prime is 28543717. The next prime is 28543817. The reversal of 28543728 is 82734582.

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, 2208 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (1874880).

Almost surely, 2^28543728 is an apocalyptic number.

It is an amenable number.

28543728 is an abundant number, since it is smaller than the sum of its proper divisors (46451472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28543728 is a wasteful number, since it uses less digits than its factorization.

28543728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10149 (or 10143 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 28543728 is about 5342.6330587080. The cubic root of 28543728 is about 305.6118792382.

The spelling of 28543728 in words is "twenty-eight million, five hundred forty-three thousand, seven hundred twenty-eight".