28532728 has 16 divisors (see below), whose sum is σ = 61141680. Its totient is φ = 12228288.

The previous prime is 28532711. The next prime is 28532731. The reversal of 28532728 is 82723582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254701 + ... + 254812.

It is an arithmetic number, because the mean of its divisors is an integer number (3821355).

Almost surely, 2^28532728 is an apocalyptic number.

28532728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28532728 is an abundant number, since it is smaller than the sum of its proper divisors (32608952).

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

28532728 is a wasteful number, since it uses less digits than its factorization.

28532728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509526 (or 509522 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 28532728 is about 5341.6035045668. The cubic root of 28532728 is about 305.5726159412.

The spelling of 28532728 in words is "twenty-eight million, five hundred thirty-two thousand, seven hundred twenty-eight".