28940 has 12 divisors (see below), whose sum is σ = 60816. Its totient is φ = 11568.

The previous prime is 28933. The next prime is 28949. The reversal of 28940 is 4982.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (5068).

2²⁸⁹⁴⁰ is an apocalyptic number.

28940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28940 is an abundant number, since it is smaller than the sum of its proper divisors (31876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30408).

28940 is a wasteful number, since it uses less digits than its factorization.

28940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28940 is about 170.1176063786. The cubic root of 28940 is about 30.7019652355.

The spelling of 28940 in words is "twenty-eight thousand, nine hundred forty".