28865 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 22000.

The previous prime is 28859. The next prime is 28867. The reversal of 28865 is 56882.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28865.

It is not an unprimeable number, because it can be changed into a prime (28867) 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, 11 + ... + 240.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

2²⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

28865 is a deficient number, since it is larger than the sum of its proper divisors (7423).

28865 is a wasteful number, since it uses less digits than its factorization.

28865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279.

The product of its digits is 3840, while the sum is 29.

The square root of 28865 is about 169.8970276373. The cubic root of 28865 is about 30.6754202065.

It can be divided in two parts, 288 and 65, that added together give a palindrome (353).

The spelling of 28865 in words is "twenty-eight thousand, eight hundred sixty-five".