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27684 = 2232769
BaseRepresentation
bin110110000100100
31101222100
412300210
51341214
6332100
7143466
oct66044
941870
1027684
1119888
1214030
13c7a7
14a136
158309
hex6c24

27684 has 18 divisors (see below), whose sum is σ = 70070. Its totient is φ = 9216.

The previous prime is 27673. The next prime is 27689. The reversal of 27684 is 48672.

It can be written as a sum of positive squares in only one way, i.e., 22500 + 5184 = 150^2 + 72^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (27689) by changing a digit.

27684 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 349 + ... + 420.

227684 is an apocalyptic number.

It is an amenable number.

27684 is an abundant number, since it is smaller than the sum of its proper divisors (42386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27684 is a wasteful number, since it uses less digits than its factorization.

27684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 774 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 27684 is about 166.3850954863. The cubic root of 27684 is about 30.2512236829.

It can be divided in two parts, 2768 and 4, that added together give a palindrome (2772).

The spelling of 27684 in words is "twenty-seven thousand, six hundred eighty-four".