27681439 has 8 divisors (see below), whose sum is σ = 28585728. Its totient is φ = 26785440.

The previous prime is 27681427. The next prime is 27681469. The reversal of 27681439 is 93418672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27681439 - 2⁹ = 27680927 is a prime.

It is a super-5 number, since 5×27681439⁵ (a number of 38 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5109 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (3573216).

Almost surely, 2^27681439 is an apocalyptic number.

27681439 is a deficient number, since it is larger than the sum of its proper divisors (904289).

27681439 is a wasteful number, since it uses less digits than its factorization.

27681439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145.

The product of its digits is 72576, while the sum is 40.

The square root of 27681439 is about 5261.3153298391. The cubic root of 27681439 is about 302.5029082433.

The spelling of 27681439 in words is "twenty-seven million, six hundred eighty-one thousand, four hundred thirty-nine".