28130 has 16 divisors (see below), whose sum is σ = 52920. Its totient is φ = 10752.

The previous prime is 28123. The next prime is 28151. The reversal of 28130 is 3182.

28130 = 16² + 17² + ... + 44².

It can be written as a sum of positive squares in 4 ways, for example, as 22201 + 5929 = 149^2 + 77^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242 + ... + 338.

2²⁸¹³⁰ is an apocalyptic number.

28130 is a deficient number, since it is larger than the sum of its proper divisors (24790).

28130 is a wasteful number, since it uses less digits than its factorization.

28130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 28130 is about 167.7200047699. The cubic root of 28130 is about 30.4128120050.

Subtracting from 28130 its product of nonzero digits (48), we obtain a palindrome (28082).

The spelling of 28130 in words is "twenty-eight thousand, one hundred thirty".