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27881 = 72569
BaseRepresentation
bin110110011101001
31102020122
412303221
51343011
6333025
7144200
oct66351
942218
1027881
1119a47
1214175
13c8c9
14a237
1583db
hex6ce9

27881 has 6 divisors (see below), whose sum is σ = 32490. Its totient is φ = 23856.

The previous prime is 27851. The next prime is 27883. The reversal of 27881 is 18872.

It can be written as a sum of positive squares in only one way, i.e., 19600 + 8281 = 140^2 + 91^2 .

It is not a de Polignac number, because 27881 - 26 = 27817 is a prime.

It is a super-2 number, since 2×278812 = 1554700322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 27881.

It is not an unprimeable number, because it can be changed into a prime (27883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 236 + ... + 333.

It is an arithmetic number, because the mean of its divisors is an integer number (5415).

227881 is an apocalyptic number.

It is an amenable number.

27881 is a deficient number, since it is larger than the sum of its proper divisors (4609).

27881 is an equidigital number, since it uses as much as digits as its factorization.

27881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583 (or 576 counting only the distinct ones).

The product of its digits is 896, while the sum is 26.

The square root of 27881 is about 166.9760461863. The cubic root of 27881 is about 30.3228102880.

Subtracting from 27881 its reverse (18872), we obtain a palindrome (9009).

The spelling of 27881 in words is "twenty-seven thousand, eight hundred eighty-one".

Divisors: 1 7 49 569 3983 27881