28308875 has 16 divisors (see below), whose sum is σ = 40377792. Its totient is φ = 19411200.

The previous prime is 28308869. The next prime is 28308877. The reversal of 28308875 is 57880382.

28308875 = 2008² + 2009² + ... + 2014².

It is not a de Polignac number, because 28308875 - 2⁸ = 28308619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28308877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15302 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (2523612).

Almost surely, 2^28308875 is an apocalyptic number.

28308875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28308875 is a deficient number, since it is larger than the sum of its proper divisors (12068917).

28308875 is an equidigital number, since it uses as much as digits as its factorization.

28308875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32375 (or 32365 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 28308875 is about 5320.6085178295. The cubic root of 28308875 is about 304.7713954816.

The spelling of 28308875 in words is "twenty-eight million, three hundred eight thousand, eight hundred seventy-five".