27989788 has 12 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 13837472.

The previous prime is 27989771. The next prime is 27989821. The reversal of 27989788 is 88798972.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 38956 + ... + 39667.

It is an arithmetic number, because the mean of its divisors is an integer number (4127760).

Almost surely, 2^27989788 is an apocalyptic number.

It is an amenable number.

27989788 is a deficient number, since it is larger than the sum of its proper divisors (21543332).

27989788 is a wasteful number, since it uses less digits than its factorization.

27989788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78716 (or 78714 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 58.

The square root of 27989788 is about 5290.5375908314. The cubic root of 27989788 is about 303.6219764528.

It can be divided in two parts, 2798978 and 8, that multiplied together give a square (22391824 = 4732²).

The spelling of 27989788 in words is "twenty-seven million, nine hundred eighty-nine thousand, seven hundred eighty-eight".