27687986 has 4 divisors (see below), whose sum is σ = 41531982. Its totient is φ = 13843992.

The previous prime is 27687983. The next prime is 27688007. The reversal of 27687986 is 68978672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 7392961 = 4505^2 + 2719^2 .

It is not an unprimeable number, because it can be changed into a prime (27687983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6921995 + ... + 6921998.

Almost surely, 2^27687986 is an apocalyptic number.

27687986 is a deficient number, since it is larger than the sum of its proper divisors (13843996).

27687986 is a wasteful number, since it uses less digits than its factorization.

27687986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13843995.

The product of its digits is 2032128, while the sum is 53.

The square root of 27687986 is about 5261.9374758733. The cubic root of 27687986 is about 302.5267549134.

The spelling of 27687986 in words is "twenty-seven million, six hundred eighty-seven thousand, nine hundred eighty-six".