27985518864 has 60 divisors (see below), whose sum is σ = 82927684476. Its totient is φ = 8779769856.

The previous prime is 27985518853. The next prime is 27985518877. The reversal of 27985518864 is 46881558972.

27985518864 is a `hidden beast` number, since 2 + 79 + 8 + 551 + 8 + 8 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23280656400 + 4704862464 = 152580^2 + 68592^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5713549 + ... + 5718444.

Almost surely, 2^27985518864 is an apocalyptic number.

27985518864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

27985518864 is an abundant number, since it is smaller than the sum of its proper divisors (54942165612).

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

27985518864 is a wasteful number, since it uses less digits than its factorization.

27985518864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11432024 (or 11432015 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 63.

The spelling of 27985518864 in words is "twenty-seven billion, nine hundred eighty-five million, five hundred eighteen thousand, eight hundred sixty-four".