28999 has 4 divisors (see below), whose sum is σ = 29664. Its totient is φ = 28336.

The previous prime is 28979. The next prime is 29009. The reversal of 28999 is 99982.

28999 = 67² + 68² + ... + 72².

28999 is nontrivially palindromic in base 2 and base 8.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99982 = 2 ⋅49991.

It is a cyclic number.

It is not a de Polignac number, because 28999 - 2⁷ = 28871 is a prime.

It is a Duffinian number.

28999 is a modest number, since divided by 999 gives 28 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28909) 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, 262 + ... + 355.

It is an arithmetic number, because the mean of its divisors is an integer number (7416).

2²⁸⁹⁹⁹ is an apocalyptic number.

28999 is a deficient number, since it is larger than the sum of its proper divisors (665).

28999 is an equidigital number, since it uses as much as digits as its factorization.

28999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its digits is 11664, while the sum is 37.

The square root of 28999 is about 170.2909275329. The cubic root of 28999 is about 30.7228151129.

It can be divided in two parts, 28 and 999, that multiplied together give a palindrome (27972).

The spelling of 28999 in words is "twenty-eight thousand, nine hundred ninety-nine".