27688221842 has 18 divisors (see below), whose sum is σ = 41999539743. Its totient is φ = 13690092672.

The previous prime is 27688221823. The next prime is 27688221853. The reversal of 27688221842 is 24812288672.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 637512001 + 27050709841 = 25249^2 + 164471^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=117661.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22825628 + ... + 22826840.

Almost surely, 2^27688221842 is an apocalyptic number.

27688221842 is a deficient number, since it is larger than the sum of its proper divisors (14311317901).

27688221842 is an frugal number, since it uses more digits than its factorization.

27688221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 1312 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 50.

Multiplying 27688221842 by its sum of digits (50), we get a square (1384411092100 = 1176610²).

The spelling of 27688221842 in words is "twenty-seven billion, six hundred eighty-eight million, two hundred twenty-one thousand, eight hundred forty-two".