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28093 = 132161
BaseRepresentation
bin110110110111101
31102112111
412312331
51344333
6334021
7144622
oct66675
942474
1028093
111a11a
1214311
13ca30
14a349
1584cd
hex6dbd

28093 has 4 divisors (see below), whose sum is σ = 30268. Its totient is φ = 25920.

The previous prime is 28087. The next prime is 28097. The reversal of 28093 is 39082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39082 = 219541.

It can be written as a sum of positive squares in 2 ways, for example, as 10404 + 17689 = 102^2 + 133^2 .

It is a cyclic number.

It is not a de Polignac number, because 28093 - 29 = 27581 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068 + ... + 1093.

It is an arithmetic number, because the mean of its divisors is an integer number (7567).

228093 is an apocalyptic number.

It is an amenable number.

28093 is a deficient number, since it is larger than the sum of its proper divisors (2175).

28093 is a wasteful number, since it uses less digits than its factorization.

28093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 28093 is about 167.6096655924. The cubic root of 28093 is about 30.3994719437.

It can be divided in two parts, 280 and 93, that added together give a palindrome (373).

The spelling of 28093 in words is "twenty-eight thousand, ninety-three".

Divisors: 1 13 2161 28093