28507 has 4 divisors (see below), whose sum is σ = 29520. Its totient is φ = 27496.

The previous prime is 28499. The next prime is 28513. The reversal of 28507 is 70582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70582 = 2 ⋅35291.

It is a cyclic number.

It is not a de Polignac number, because 28507 - 2³ = 28499 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (28517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463 + ... + 520.

It is an arithmetic number, because the mean of its divisors is an integer number (7380).

2²⁸⁵⁰⁷ is an apocalyptic number.

28507 is a deficient number, since it is larger than the sum of its proper divisors (1013).

28507 is an equidigital number, since it uses as much as digits as its factorization.

28507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28507 is about 168.8401610992. The cubic root of 28507 is about 30.5480743239.

It can be divided in two parts, 28 and 507, that multiplied together give a triangular number (14196 = T₁₆₈).

The spelling of 28507 in words is "twenty-eight thousand, five hundred seven".