27931986 has 32 divisors (see below), whose sum is σ = 65724480. Its totient is φ = 8762688.

The previous prime is 27931979. The next prime is 27931991. The reversal of 27931986 is 68913972.

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, 14296 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (2053890).

Almost surely, 2^27931986 is an apocalyptic number.

27931986 is an abundant number, since it is smaller than the sum of its proper divisors (37792494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27931986 is a wasteful number, since it uses less digits than its factorization.

27931986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30455 (or 30449 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 27931986 is about 5285.0719957253. The cubic root of 27931986 is about 303.4128281230.

The spelling of 27931986 in words is "twenty-seven million, nine hundred thirty-one thousand, nine hundred eighty-six".