28815875 has 32 divisors (see below), whose sum is σ = 41333760. Its totient is φ = 19836000.

The previous prime is 28815869. The next prime is 28815881. The reversal of 28815875 is 57851882.

It is an interprime number because it is at equal distance from previous prime (28815869) and next prime (28815881).

It is not a de Polignac number, because 28815875 - 2⁶ = 28815811 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 25574 + ... + 26676.

It is an arithmetic number, because the mean of its divisors is an integer number (1291680).

Almost surely, 2^28815875 is an apocalyptic number.

28815875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28815875 is a deficient number, since it is larger than the sum of its proper divisors (12517885).

28815875 is a wasteful number, since it uses less digits than its factorization.

28815875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1138 counting only the distinct ones).

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

The square root of 28815875 is about 5368.0420080324. The cubic root of 28815875 is about 306.5800828080.

The spelling of 28815875 in words is "twenty-eight million, eight hundred fifteen thousand, eight hundred seventy-five".