28369 has 4 divisors (see below), whose sum is σ = 30960. Its totient is φ = 25780.

The previous prime is 28351. The next prime is 28387. The reversal of 28369 is 96382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28351) and next prime (28387).

It is a cyclic number.

It is not a de Polignac number, because 28369 - 2¹¹ = 26321 is a prime.

It is a super-2 number, since 2×28369² = 1609600322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28309) 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, 1279 + ... + 1300.

It is an arithmetic number, because the mean of its divisors is an integer number (7740).

2²⁸³⁶⁹ is an apocalyptic number.

It is an amenable number.

28369 is a deficient number, since it is larger than the sum of its proper divisors (2591).

28369 is a wasteful number, since it uses less digits than its factorization.

28369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590.

The product of its digits is 2592, while the sum is 28.

The square root of 28369 is about 168.4309947723. The cubic root of 28369 is about 30.4987010107.

The spelling of 28369 in words is "twenty-eight thousand, three hundred sixty-nine".