28838 has 4 divisors (see below), whose sum is σ = 43260. Its totient is φ = 14418.

The previous prime is 28837. The next prime is 28843. The reversal of 28838 is 83882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83882 = 2 ⋅41941.

It is a self number, because there is not a number n which added to its sum of digits gives 28838.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28838.

It is not an unprimeable number, because it can be changed into a prime (28837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7208 + ... + 7211.

It is an arithmetic number, because the mean of its divisors is an integer number (10815).

2²⁸⁸³⁸ is an apocalyptic number.

28838 is a deficient number, since it is larger than the sum of its proper divisors (14422).

28838 is a wasteful number, since it uses less digits than its factorization.

28838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14421.

The product of its digits is 3072, while the sum is 29.

The square root of 28838 is about 169.8175491520. The cubic root of 28838 is about 30.6658527404.

The spelling of 28838 in words is "twenty-eight thousand, eight hundred thirty-eight".