28769 has 4 divisors (see below), whose sum is σ = 30996. Its totient is φ = 26544.

The previous prime is 28759. The next prime is 28771. The reversal of 28769 is 96782.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 10000 = 137^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 28769 - 2⁴ = 28753 is a prime.

It is a super-2 number, since 2×28769² = 1655310722, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28769.

It is not an unprimeable number, because it can be changed into a prime (28729) 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, 1094 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (7749).

2²⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

28769 is a deficient number, since it is larger than the sum of its proper divisors (2227).

28769 is a wasteful number, since it uses less digits than its factorization.

28769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226.

The product of its digits is 6048, while the sum is 32.

The square root of 28769 is about 169.6142682677. The cubic root of 28769 is about 30.6413753879.

It can be divided in two parts, 28 and 769, that added together give a palindrome (797).

The spelling of 28769 in words is "twenty-eight thousand, seven hundred sixty-nine".