28928875 has 8 divisors (see below), whose sum is σ = 36103392. Its totient is φ = 23143000.

The previous prime is 28928843. The next prime is 28928891. The reversal of 28928875 is 57882982.

It is not a de Polignac number, because 28928875 - 2⁵ = 28928843 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, 115591 + ... + 115840.

It is an arithmetic number, because the mean of its divisors is an integer number (4512924).

Almost surely, 2^28928875 is an apocalyptic number.

28928875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28928875 is a deficient number, since it is larger than the sum of its proper divisors (7174517).

28928875 is an equidigital number, since it uses as much as digits as its factorization.

28928875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231446 (or 231436 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 28928875 is about 5378.5569626062. The cubic root of 28928875 is about 306.9803062201.

The spelling of 28928875 in words is "twenty-eight million, nine hundred twenty-eight thousand, eight hundred seventy-five".