27081891 has 16 divisors (see below), whose sum is σ = 41207200. Its totient is φ = 17565984.

The previous prime is 27081881. The next prime is 27081907. The reversal of 27081891 is 19818072.

It is not a de Polignac number, because 27081891 - 2⁶ = 27081827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27081841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12556 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (2575450).

Almost surely, 2^27081891 is an apocalyptic number.

27081891 is a deficient number, since it is larger than the sum of its proper divisors (14125309).

27081891 is a wasteful number, since it uses less digits than its factorization.

27081891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27155 (or 27149 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 27081891 is about 5204.0264219160. The cubic root of 27081891 is about 300.3029938793.

It can be divided in two parts, 27081 and 891, that added together give a palindrome (27972).

The spelling of 27081891 in words is "twenty-seven million, eighty-one thousand, eight hundred ninety-one".