28515 has 8 divisors (see below), whose sum is σ = 45648. Its totient is φ = 15200.

The previous prime is 28513. The next prime is 28517. The reversal of 28515 is 51582.

It is an interprime number because it is at equal distance from previous prime (28513) and next prime (28517).

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

It is not a de Polignac number, because 28515 - 2¹ = 28513 is a prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 28491 and 28500.

It is not an unprimeable number, because it can be changed into a prime (28513) 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, 936 + ... + 965.

It is an arithmetic number, because the mean of its divisors is an integer number (5706).

2²⁸⁵¹⁵ is an apocalyptic number.

28515 is a deficient number, since it is larger than the sum of its proper divisors (17133).

28515 is a wasteful number, since it uses less digits than its factorization.

28515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909.

The product of its digits is 400, while the sum is 21.

The square root of 28515 is about 168.8638504832. The cubic root of 28515 is about 30.5509316542.

It can be divided in two parts, 285 and 15, that added together give a triangular number (300 = T₂₄).

The spelling of 28515 in words is "twenty-eight thousand, five hundred fifteen".