27978875916 has 24 divisors (see below), whose sum is σ = 65917872384. Its totient is φ = 9235745040.

The previous prime is 27978875891. The next prime is 27978875933. The reversal of 27978875916 is 61957887972.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11317080 + ... + 11319551.

It is an arithmetic number, because the mean of its divisors is an integer number (2746578016).

Almost surely, 2^27978875916 is an apocalyptic number.

It is an amenable number.

27978875916 is an abundant number, since it is smaller than the sum of its proper divisors (37938996468).

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

27978875916 is a wasteful number, since it uses less digits than its factorization.

27978875916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22636741 (or 22636739 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 69.

The spelling of 27978875916 in words is "twenty-seven billion, nine hundred seventy-eight million, eight hundred seventy-five thousand, nine hundred sixteen".