28090 has 12 divisors (see below), whose sum is σ = 51534. Its totient is φ = 11024.

The previous prime is 28087. The next prime is 28097. The reversal of 28090 is 9082.

It can be written as a sum of positive squares in 3 ways, for example, as 26569 + 1521 = 163^2 + 39^2 .

It is not an unprimeable number, because it can be changed into a prime (28097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 504 + ... + 556.

2²⁸⁰⁹⁰ is an apocalyptic number.

28090 is a deficient number, since it is larger than the sum of its proper divisors (23444).

28090 is an equidigital number, since it uses as much as digits as its factorization.

28090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28090 is about 167.6007159889. The cubic root of 28090 is about 30.3983898039.

It can be divided in two parts, 280 and 90, that multiplied together give a triangular number (25200 = T₂₂₄).

The spelling of 28090 in words is "twenty-eight thousand, ninety".