28406 has 8 divisors (see below), whose sum is σ = 48720. Its totient is φ = 12168.

The previous prime is 28403. The next prime is 28409. The reversal of 28406 is 60482.

It is an interprime number because it is at equal distance from previous prime (28403) and next prime (28409).

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 a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403) 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, 1001 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (6090).

2²⁸⁴⁰⁶ is an apocalyptic number.

28406 is a deficient number, since it is larger than the sum of its proper divisors (20314).

28406 is a wasteful number, since it uses less digits than its factorization.

28406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28406 is about 168.5407962483. The cubic root of 28406 is about 30.5119544646.

Adding to 28406 its reverse (60482), we get a palindrome (88888).

It can be divided in two parts, 28 and 406, that added together give a palindrome (434).

The spelling of 28406 in words is "twenty-eight thousand, four hundred six".