27805081 has 8 divisors (see below), whose sum is σ = 29924424. Its totient is φ = 25739520.

The previous prime is 27805051. The next prime is 27805097. The reversal of 27805081 is 18050872.

It can be written as a sum of positive squares in 4 ways, for example, as 3549456 + 24255625 = 1884^2 + 4925^2 .

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 27805081 - 2⁵ = 27805049 is a prime.

It is a super-2 number, since 2×27805081² = 1546245058833122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27805031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12370 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (3740553).

Almost surely, 2^27805081 is an apocalyptic number.

It is an amenable number.

27805081 is a deficient number, since it is larger than the sum of its proper divisors (2119343).

27805081 is a wasteful number, since it uses less digits than its factorization.

27805081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26891.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 27805081 is about 5273.0523418605. The cubic root of 27805081 is about 302.9526261407.

The spelling of 27805081 in words is "twenty-seven million, eight hundred five thousand, eighty-one".