27731985 has 16 divisors (see below), whose sum is σ = 45209664. Its totient is φ = 14510912.

The previous prime is 27731969. The next prime is 27732007. The reversal of 27731985 is 58913772.

It is a cyclic number.

It is not a de Polignac number, because 27731985 - 2⁴ = 27731969 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16647 + ... + 18236.

It is an arithmetic number, because the mean of its divisors is an integer number (2825604).

Almost surely, 2^27731985 is an apocalyptic number.

It is an amenable number.

27731985 is a deficient number, since it is larger than the sum of its proper divisors (17477679).

27731985 is a wasteful number, since it uses less digits than its factorization.

27731985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34944.

The product of its digits is 105840, while the sum is 42.

The square root of 27731985 is about 5266.1166906934. The cubic root of 27731985 is about 302.6869186047.

The spelling of 27731985 in words is "twenty-seven million, seven hundred thirty-one thousand, nine hundred eighty-five".