28915 has 4 divisors (see below), whose sum is σ = 34704. Its totient is φ = 23128.

The previous prime is 28909. The next prime is 28921. The reversal of 28915 is 51982.

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

It is an interprime number because it is at equal distance from previous prime (28909) and next prime (28921).

It is a cyclic number.

It is not a de Polignac number, because 28915 - 2⁹ = 28403 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 28915.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887 + ... + 2896.

It is an arithmetic number, because the mean of its divisors is an integer number (8676).

2²⁸⁹¹⁵ is an apocalyptic number.

28915 is a deficient number, since it is larger than the sum of its proper divisors (5789).

28915 is an equidigital number, since it uses as much as digits as its factorization.

28915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788.

The product of its digits is 720, while the sum is 25.

The square root of 28915 is about 170.0441119239. The cubic root of 28915 is about 30.6931219936.

The spelling of 28915 in words is "twenty-eight thousand, nine hundred fifteen".