27806131986 has 16 divisors (see below), whose sum is σ = 55711049184. Its totient is φ = 9252246464.

The previous prime is 27806131897. The next prime is 27806131993. The reversal of 27806131986 is 68913160872.

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, 4112391 + ... + 4119146.

It is an arithmetic number, because the mean of its divisors is an integer number (3481940574).

Almost surely, 2^27806131986 is an apocalyptic number.

27806131986 is an abundant number, since it is smaller than the sum of its proper divisors (27904917198).

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

27806131986 is a wasteful number, since it uses less digits than its factorization.

27806131986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8232105.

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 27806131986 in words is "twenty-seven billion, eight hundred six million, one hundred thirty-one thousand, nine hundred eighty-six".