28375 has 8 divisors (see below), whose sum is σ = 35568. Its totient is φ = 22600.

The previous prime is 28351. The next prime is 28387. The reversal of 28375 is 57382.

It is not a de Polignac number, because 28375 - 2¹³ = 20183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a d-powerful number, because it can be written as 2¹³ + 8 + 3⁵ + 7⁵ + 5⁵ .

It is a Duffinian number.

28375 is a lucky number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12 + ... + 238.

It is an arithmetic number, because the mean of its divisors is an integer number (4446).

2²⁸³⁷⁵ is an apocalyptic number.

28375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28375 is a deficient number, since it is larger than the sum of its proper divisors (7193).

28375 is an equidigital number, since it uses as much as digits as its factorization.

28375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 232 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 28375 is about 168.4488052792. The cubic root of 28375 is about 30.5008510020.

The spelling of 28375 in words is "twenty-eight thousand, three hundred seventy-five".