28012 has 12 divisors (see below), whose sum is σ = 50400. Its totient is φ = 13616.

The previous prime is 28001. The next prime is 28019. The reversal of 28012 is 21082.

It is a plaindrome in base 7.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 27983 and 28001.

It is not an unprimeable number, because it can be changed into a prime (28019) by changing a digit.

28012 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 in 3 ways as a sum of consecutive naturals, for example, 114 + ... + 262.

It is an arithmetic number, because the mean of its divisors is an integer number (4200).

2²⁸⁰¹² is an apocalyptic number.

It is an amenable number.

28012 is a deficient number, since it is larger than the sum of its proper divisors (22388).

28012 is a wasteful number, since it uses less digits than its factorization.

28012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 28012 is about 167.3678583241. The cubic root of 28012 is about 30.3702270834.

Adding to 28012 its reverse (21082), we get a palindrome (49094).

It can be divided in two parts, 280 and 12, that added together give a palindrome (292).

The spelling of 28012 in words is "twenty-eight thousand, twelve".