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28159 = 29971
BaseRepresentation
bin110110111111111
31102121221
412313333
51400114
6334211
7145045
oct66777
942557
1028159
111a17a
1214367
13ca81
14a395
158524
hex6dff

28159 has 4 divisors (see below), whose sum is σ = 29160. Its totient is φ = 27160.

The previous prime is 28151. The next prime is 28163. The reversal of 28159 is 95182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95182 = 247591.

It is a cyclic number.

It is not a de Polignac number, because 28159 - 23 = 28151 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8 and base 16.

It is a nialpdrome in base 13.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (7290).

228159 is an apocalyptic number.

28159 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28159 is a deficient number, since it is larger than the sum of its proper divisors (1001).

28159 is an equidigital number, since it uses as much as digits as its factorization.

28159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its digits is 720, while the sum is 25.

The square root of 28159 is about 167.8064361102. The cubic root of 28159 is about 30.4232595538.

The spelling of 28159 in words is "twenty-eight thousand, one hundred fifty-nine".

Divisors: 1 29 971 28159