28015888 has 20 divisors (see below), whose sum is σ = 54371520. Its totient is φ = 13984544.

The previous prime is 28015843. The next prime is 28015907. The reversal of 28015888 is 88851082.

It is a self number, because there is not a number n which added to its sum of digits gives 28015888.

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 3 ways as a sum of consecutive naturals, for example, 12381 + ... + 14467.

It is an arithmetic number, because the mean of its divisors is an integer number (2718576).

Almost surely, 2^28015888 is an apocalyptic number.

It is an amenable number.

28015888 is a deficient number, since it is larger than the sum of its proper divisors (26355632).

28015888 is a wasteful number, since it uses less digits than its factorization.

28015888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934 (or 2928 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 40.

The square root of 28015888 is about 5293.0036841098. The cubic root of 28015888 is about 303.7163212390.

The spelling of 28015888 in words is "twenty-eight million, fifteen thousand, eight hundred eighty-eight".