28065 has 8 divisors (see below), whose sum is σ = 44928. Its totient is φ = 14960.

The previous prime is 28057. The next prime is 28069. The reversal of 28065 is 56082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28065 - 2³ = 28057 is a prime.

It is a Curzon number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (5616).

2²⁸⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

28065 is a deficient number, since it is larger than the sum of its proper divisors (16863).

28065 is a wasteful number, since it uses less digits than its factorization.

28065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28065 is about 167.5261173668. The cubic root of 28065 is about 30.3893689743.

The spelling of 28065 in words is "twenty-eight thousand, sixty-five".