28047 has 4 divisors (see below), whose sum is σ = 37400. Its totient is φ = 18696.

The previous prime is 28031. The next prime is 28051. The reversal of 28047 is 74082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28047 - 2⁴ = 28031 is a prime.

It is a D-number.

It is a Duffinian number.

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 28047.

It is not an unprimeable number, because it can be changed into a prime (28027) 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, 4672 + ... + 4677.

It is an arithmetic number, because the mean of its divisors is an integer number (9350).

2²⁸⁰⁴⁷ is an apocalyptic number.

28047 is a deficient number, since it is larger than the sum of its proper divisors (9353).

28047 is an equidigital number, since it uses as much as digits as its factorization.

28047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 28047 is about 167.4723857834. The cubic root of 28047 is about 30.3828706594.

The spelling of 28047 in words is "twenty-eight thousand, forty-seven".