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28361 = 79359
BaseRepresentation
bin110111011001001
31102220102
412323021
51401421
6335145
7145454
oct67311
942812
1028361
111a343
12144b5
13cba8
14a49b
15860b
hex6ec9

28361 has 4 divisors (see below), whose sum is σ = 28800. Its totient is φ = 27924.

The previous prime is 28351. The next prime is 28387. The reversal of 28361 is 16382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16382 = 28191.

It is a cyclic number.

It is not a de Polignac number, because 28361 - 26 = 28297 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 28361.

It is not an unprimeable number, because it can be changed into a prime (28351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101 + ... + 258.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

228361 is an apocalyptic number.

It is an amenable number.

28361 is a deficient number, since it is larger than the sum of its proper divisors (439).

28361 is an equidigital number, since it uses as much as digits as its factorization.

28361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its digits is 288, while the sum is 20.

The square root of 28361 is about 168.4072444998. The cubic root of 28361 is about 30.4958338841.

The spelling of 28361 in words is "twenty-eight thousand, three hundred sixty-one".

Divisors: 1 79 359 28361