28750 has 20 divisors (see below), whose sum is σ = 56232. Its totient is φ = 11000.

The previous prime is 28729. The next prime is 28751. The reversal of 28750 is 5782.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1239 + ... + 1261.

2²⁸⁷⁵⁰ is an apocalyptic number.

28750 is a deficient number, since it is larger than the sum of its proper divisors (27482).

28750 is an equidigital number, since it uses as much as digits as its factorization.

28750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45 (or 30 counting only the distinct ones).

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

The square root of 28750 is about 169.5582495781. The cubic root of 28750 is about 30.6346283761.

The spelling of 28750 in words is "twenty-eight thousand, seven hundred fifty".