27806581138 has 16 divisors (see below), whose sum is σ = 47812446144. Its totient is φ = 11881100880.

The previous prime is 27806581129. The next prime is 27806581157. The reversal of 27806581138 is 83118560872.

It is a junction number, because it is equal to n+sod(n) for n = 27806581091 and 27806581100.

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 7 ways as a sum of consecutive naturals, for example, 2995645 + ... + 3004912.

It is an arithmetic number, because the mean of its divisors is an integer number (2988277884).

Almost surely, 2^27806581138 is an apocalyptic number.

27806581138 is a deficient number, since it is larger than the sum of its proper divisors (20005865006).

27806581138 is a wasteful number, since it uses less digits than its factorization.

27806581138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000897.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 27806581138 in words is "twenty-seven billion, eight hundred six million, five hundred eighty-one thousand, one hundred thirty-eight".