28728844 has 48 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 12953600.

The previous prime is 28728787. The next prime is 28728851. The reversal of 28728844 is 44882782.

Its product of digits (229376) is a multiple of the sum of its prime divisors (256).

It is a self number, because there is not a number n which added to its sum of digits gives 28728844.

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 15 ways as a sum of consecutive naturals, for example, 284394 + ... + 284494.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^28728844 is an apocalyptic number.

It is an amenable number.

28728844 is a deficient number, since it is larger than the sum of its proper divisors (26791796).

28728844 is a wasteful number, since it uses less digits than its factorization.

28728844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 256 counting only the distinct ones).

The product of its digits is 229376, while the sum is 43.

The square root of 28728844 is about 5359.9294771480. The cubic root of 28728844 is about 306.2711225748.

The spelling of 28728844 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred forty-four".