27989808912 has 240 divisors, whose sum is σ = 85580022528. Its totient is φ = 8488488960.

The previous prime is 27989808857. The next prime is 27989808929. The reversal of 27989808912 is 21980898972.

It is a self number, because there is not a number n which added to its sum of digits gives 27989808912.

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 47 ways as a sum of consecutive naturals, for example, 64941337 + ... + 64941767.

Almost surely, 2^27989808912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27989808912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42790011264).

27989808912 is an abundant number, since it is smaller than the sum of its proper divisors (57590213616).

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

27989808912 is a wasteful number, since it uses less digits than its factorization.

27989808912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 27989808912 in words is "twenty-seven billion, nine hundred eighty-nine million, eight hundred eight thousand, nine hundred twelve".