27681261 has 16 divisors (see below), whose sum is σ = 37995264. Its totient is φ = 17917184.

The previous prime is 27681239. The next prime is 27681263. The reversal of 27681261 is 16218672.

It is a cyclic number.

It is not a de Polignac number, because 27681261 - 2⁷ = 27681133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681263) 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, 18601 + ... + 20033.

It is an arithmetic number, because the mean of its divisors is an integer number (2374704).

Almost surely, 2^27681261 is an apocalyptic number.

It is an amenable number.

27681261 is a deficient number, since it is larger than the sum of its proper divisors (10314003).

27681261 is a wasteful number, since it uses less digits than its factorization.

27681261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its digits is 8064, while the sum is 33.

The square root of 27681261 is about 5261.2984138899. The cubic root of 27681261 is about 302.5022598470.

The spelling of 27681261 in words is "twenty-seven million, six hundred eighty-one thousand, two hundred sixty-one".