27799866 has 12 divisors (see below), whose sum is σ = 60233082. Its totient is φ = 9266616.

The previous prime is 27799843. The next prime is 27799867. The reversal of 27799866 is 66899772.

It can be written as a sum of positive squares in only one way, i.e., 15374241 + 12425625 = 3921^2 + 3525^2 .

It is not an unprimeable number, because it can be changed into a prime (27799867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772201 + ... + 772236.

Almost surely, 2^27799866 is an apocalyptic number.

27799866 is an abundant number, since it is smaller than the sum of its proper divisors (32433216).

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

27799866 is a wasteful number, since it uses less digits than its factorization.

27799866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544445 (or 1544442 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 27799866 is about 5272.5578232960. The cubic root of 27799866 is about 302.9336847977.

The spelling of 27799866 in words is "twenty-seven million, seven hundred ninety-nine thousand, eight hundred sixty-six".