28193 has 6 divisors (see below), whose sum is σ = 31122. Its totient is φ = 25520.

The previous prime is 28183. The next prime is 28201. The reversal of 28193 is 39182.

It can be written as a sum of positive squares in only one way, i.e., 20449 + 7744 = 143^2 + 88^2 .

It is not a de Polignac number, because 28193 - 2¹² = 24097 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28193.

It is not an unprimeable number, because it can be changed into a prime (28123) 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 5 ways as a sum of consecutive naturals, for example, 5 + ... + 237.

It is an arithmetic number, because the mean of its divisors is an integer number (5187).

2²⁸¹⁹³ is an apocalyptic number.

It is an amenable number.

28193 is a deficient number, since it is larger than the sum of its proper divisors (2929).

28193 is a wasteful number, since it uses less digits than its factorization.

28193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 244 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 28193 is about 167.9077127472. The cubic root of 28193 is about 30.4354992733.

The spelling of 28193 in words is "twenty-eight thousand, one hundred ninety-three".