27985881 has 16 divisors (see below), whose sum is σ = 46522368. Its totient is φ = 14538000.

The previous prime is 27985873. The next prime is 27985907. The reversal of 27985881 is 18858972.

It is not a de Polignac number, because 27985881 - 2³ = 27985873 is a prime.

It is a super-2 number, since 2×27985881² = 1566419070692322, 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 27985881.

It is not an unprimeable number, because it can be changed into a prime (27985381) 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, 60345 + ... + 60806.

It is an arithmetic number, because the mean of its divisors is an integer number (2907648).

Almost surely, 2^27985881 is an apocalyptic number.

27985881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27985881 is a deficient number, since it is larger than the sum of its proper divisors (18536487).

27985881 is a wasteful number, since it uses less digits than its factorization.

27985881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121172.

The product of its digits is 322560, while the sum is 48.

The square root of 27985881 is about 5290.1683338056. The cubic root of 27985881 is about 303.6078486066.

The spelling of 27985881 in words is "twenty-seven million, nine hundred eighty-five thousand, eight hundred eighty-one".