28831375 has 16 divisors (see below), whose sum is σ = 36159552. Its totient is φ = 22951200.

The previous prime is 28831367. The next prime is 28831393. The reversal of 28831375 is 57313882.

It is not a de Polignac number, because 28831375 - 2³ = 28831367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32437 + ... + 33313.

It is an arithmetic number, because the mean of its divisors is an integer number (2259972).

Almost surely, 2^28831375 is an apocalyptic number.

28831375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28831375 is a deficient number, since it is larger than the sum of its proper divisors (7328177).

28831375 is an equidigital number, since it uses as much as digits as its factorization.

28831375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1145 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 28831375 is about 5369.4855433272. The cubic root of 28831375 is about 306.6350425539.

The spelling of 28831375 in words is "twenty-eight million, eight hundred thirty-one thousand, three hundred seventy-five".