27806881 has 8 divisors (see below), whose sum is σ = 28182440. Its totient is φ = 27433728.

The previous prime is 27806879. The next prime is 27806903. The reversal of 27806881 is 18860872.

It can be written as a sum of positive squares in 4 ways, for example, as 4910656 + 22896225 = 2216^2 + 4785^2 .

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 27806881 - 2¹ = 27806879 is a prime.

It is a super-2 number, since 2×27806881² = 1546445261896322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27806081) 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, 36355 + ... + 37111.

It is an arithmetic number, because the mean of its divisors is an integer number (3522805).

Almost surely, 2^27806881 is an apocalyptic number.

It is an amenable number.

27806881 is a deficient number, since it is larger than the sum of its proper divisors (375559).

27806881 is a wasteful number, since it uses less digits than its factorization.

27806881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 27806881 is about 5273.2230182309. The cubic root of 27806881 is about 302.9591633507.

The spelling of 27806881 in words is "twenty-seven million, eight hundred six thousand, eight hundred eighty-one".