28908875 has 8 divisors (see below), whose sum is σ = 36078432. Its totient is φ = 23127000.

The previous prime is 28908839. The next prime is 28908931. The reversal of 28908875 is 57880982.

It is not a de Polignac number, because 28908875 - 2²⁰ = 27860299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115511 + ... + 115760.

It is an arithmetic number, because the mean of its divisors is an integer number (4509804).

Almost surely, 2^28908875 is an apocalyptic number.

28908875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28908875 is a deficient number, since it is larger than the sum of its proper divisors (7169557).

28908875 is an equidigital number, since it uses as much as digits as its factorization.

28908875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231286 (or 231276 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 28908875 is about 5376.6974064011. The cubic root of 28908875 is about 306.9095462206.

The spelling of 28908875 in words is "twenty-eight million, nine hundred eight thousand, eight hundred seventy-five".