27989766 has 32 divisors (see below), whose sum is σ = 71086080. Its totient is φ = 7996968.

The previous prime is 27989747. The next prime is 27989771. The reversal of 27989766 is 66798972.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent 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, 36646 + ... + 37401.

It is an arithmetic number, because the mean of its divisors is an integer number (2221440).

Almost surely, 2^27989766 is an apocalyptic number.

27989766 is an abundant number, since it is smaller than the sum of its proper divisors (43096314).

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

27989766 is a wasteful number, since it uses less digits than its factorization.

27989766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74065 (or 74059 counting only the distinct ones).

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

The square root of 27989766 is about 5290.5355116472. The cubic root of 27989766 is about 303.6218969037.

The spelling of 27989766 in words is "twenty-seven million, nine hundred eighty-nine thousand, seven hundred sixty-six".