27985523889 has 16 divisors (see below), whose sum is σ = 37670356800. Its totient is φ = 18479462400.

The previous prime is 27985523851. The next prime is 27985523903. The reversal of 27985523889 is 98832558972.

It is not a de Polignac number, because 27985523889 - 2¹¹ = 27985521841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27985523809) 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 in 15 ways as a sum of consecutive naturals, for example, 108714 + ... + 260364.

It is an arithmetic number, because the mean of its divisors is an integer number (2354397300).

Almost surely, 2^27985523889 is an apocalyptic number.

It is an amenable number.

27985523889 is a deficient number, since it is larger than the sum of its proper divisors (9684832911).

27985523889 is a wasteful number, since it uses less digits than its factorization.

27985523889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152240.

The product of its digits is 87091200, while the sum is 66.

The spelling of 27985523889 in words is "twenty-seven billion, nine hundred eighty-five million, five hundred twenty-three thousand, eight hundred eighty-nine".