27655881 has 24 divisors (see below), whose sum is σ = 41419392. Its totient is φ = 16394400.

The previous prime is 27655847. The next prime is 27655891. The reversal of 27655881 is 18855672.

It is not a de Polignac number, because 27655881 - 2¹⁰ = 27654857 is a prime.

It is a super-2 number, since 2×27655881² = 1529695507772322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27655841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16251 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (1725808).

Almost surely, 2^27655881 is an apocalyptic number.

It is an amenable number.

27655881 is a deficient number, since it is larger than the sum of its proper divisors (13763511).

27655881 is a wasteful number, since it uses less digits than its factorization.

27655881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1682 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 27655881 is about 5258.8859086312. The cubic root of 27655881 is about 302.4097802574.

It can be divided in two parts, 2765 and 5881, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 27655881 in words is "twenty-seven million, six hundred fifty-five thousand, eight hundred eighty-one".