27787881 has 16 divisors (see below), whose sum is σ = 40840128. Its totient is φ = 16665600.

The previous prime is 27787867. The next prime is 27787889. The reversal of 27787881 is 18878772.

It is not a de Polignac number, because 27787881 - 2⁹ = 27787369 is a prime.

It is a super-2 number, since 2×27787881² = 1544332660940322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27787881.

It is not an unprimeable number, because it can be changed into a prime (27787889) 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, 1140 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (2552508).

Almost surely, 2^27787881 is an apocalyptic number.

It is an amenable number.

27787881 is a deficient number, since it is larger than the sum of its proper divisors (13052247).

27787881 is a wasteful number, since it uses less digits than its factorization.

27787881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8792.

The product of its digits is 351232, while the sum is 48.

The square root of 27787881 is about 5271.4211556278. The cubic root of 27787881 is about 302.8901452343.

The spelling of 27787881 in words is "twenty-seven million, seven hundred eighty-seven thousand, eight hundred eighty-one".