28508 has 6 divisors (see below), whose sum is σ = 49896. Its totient is φ = 14252.

The previous prime is 28499. The next prime is 28513. The reversal of 28508 is 80582.

It is a congruent number.

It is an unprimeable number.

28508 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560 + ... + 3567.

It is an arithmetic number, because the mean of its divisors is an integer number (8316).

2²⁸⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

28508 is a deficient number, since it is larger than the sum of its proper divisors (21388).

28508 is a wasteful number, since it uses less digits than its factorization.

28508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131 (or 7129 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28508 is about 168.8431224540. The cubic root of 28508 is about 30.5484315194.

The spelling of 28508 in words is "twenty-eight thousand, five hundred eight".