28013875 has 16 divisors (see below), whose sum is σ = 37020672. Its totient is φ = 21091200.

The previous prime is 28013873. The next prime is 28013879. The reversal of 28013875 is 57831082.

It is not a de Polignac number, because 28013875 - 2¹ = 28013873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28013875.

It is not an unprimeable number, because it can be changed into a prime (28013873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4467 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (2313792).

Almost surely, 2^28013875 is an apocalyptic number.

28013875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28013875 is a deficient number, since it is larger than the sum of its proper divisors (9006797).

28013875 is a wasteful number, since it uses less digits than its factorization.

28013875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13215 (or 13205 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28013875 is about 5292.8135240154. The cubic root of 28013875 is about 303.7090468477.

The spelling of 28013875 in words is "twenty-eight million, thirteen thousand, eight hundred seventy-five".