28538 has 8 divisors (see below), whose sum is σ = 45120. Its totient is φ = 13500.

The previous prime is 28537. The next prime is 28541. The reversal of 28538 is 83582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28537) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 338 + ... + 413.

It is an arithmetic number, because the mean of its divisors is an integer number (5640).

2²⁸⁵³⁸ is an apocalyptic number.

28538 is a deficient number, since it is larger than the sum of its proper divisors (16582).

28538 is a wasteful number, since it uses less digits than its factorization.

28538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its digits is 1920, while the sum is 26.

The square root of 28538 is about 168.9319389577. The cubic root of 28538 is about 30.5591435028.

It can be divided in two parts, 285 and 38, that added together give a palindrome (323).

The spelling of 28538 in words is "twenty-eight thousand, five hundred thirty-eight".