28715885 has 32 divisors (see below), whose sum is σ = 39267072. Its totient is φ = 19975680.

The previous prime is 28715849. The next prime is 28715909. The reversal of 28715885 is 58851782.

It is not a de Polignac number, because 28715885 - 2⁸ = 28715629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209537 + ... + 209673.

It is an arithmetic number, because the mean of its divisors is an integer number (1227096).

Almost surely, 2^28715885 is an apocalyptic number.

It is an amenable number.

28715885 is a deficient number, since it is larger than the sum of its proper divisors (10551187).

28715885 is a wasteful number, since it uses less digits than its factorization.

28715885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 179200, while the sum is 44.

The square root of 28715885 is about 5358.7204629464. The cubic root of 28715885 is about 306.2250647475.

The spelling of 28715885 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred eighty-five".