28575 has 18 divisors (see below), whose sum is σ = 51584. Its totient is φ = 15120.

The previous prime is 28573. The next prime is 28579. The reversal of 28575 is 57582.

It is a happy number.

It is not a de Polignac number, because 28575 - 2¹ = 28573 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 162 + ... + 288.

2²⁸⁵⁷⁵ is an apocalyptic number.

28575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28575 is a deficient number, since it is larger than the sum of its proper divisors (23009).

28575 is a wasteful number, since it uses less digits than its factorization.

28575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 135 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 28575 is about 169.0414150438. The cubic root of 28575 is about 30.5723446148.

Adding to 28575 its product of digits (2800), we get a triangular number (31375 = T₂₅₀).

The spelling of 28575 in words is "twenty-eight thousand, five hundred seventy-five".