28487 has 4 divisors (see below), whose sum is σ = 29016. Its totient is φ = 27960.

The previous prime is 28477. The next prime is 28493. The reversal of 28487 is 78482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78482 = 2 ⋅39241.

It is a cyclic number.

It is not a de Polignac number, because 28487 - 2¹² = 24391 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28487.

It is not an unprimeable number, because it can be changed into a prime (28447) 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, 173 + ... + 294.

It is an arithmetic number, because the mean of its divisors is an integer number (7254).

2²⁸⁴⁸⁷ is an apocalyptic number.

28487 is a deficient number, since it is larger than the sum of its proper divisors (529).

28487 is an equidigital number, since it uses as much as digits as its factorization.

28487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 3584, while the sum is 29.

The square root of 28487 is about 168.7809230926. The cubic root of 28487 is about 30.5409286589.

It can be divided in two parts, 28 and 487, that added together give a palindrome (515).

The spelling of 28487 in words is "twenty-eight thousand, four hundred eighty-seven".