27992591081 has 48 divisors (see below), whose sum is σ = 35521597440. Its totient is φ = 21863157120.

The previous prime is 27992591063. The next prime is 27992591093. The reversal of 27992591081 is 18019529972.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-27992591081 is a prime.

It is a super-2 number, since 2×27992591081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27992591281) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 18525116 + ... + 18526626.

It is an arithmetic number, because the mean of its divisors is an integer number (740033280).

Almost surely, 2^27992591081 is an apocalyptic number.

It is an amenable number.

27992591081 is a deficient number, since it is larger than the sum of its proper divisors (7529006359).

27992591081 is a wasteful number, since it uses less digits than its factorization.

27992591081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 27992591081 in words is "twenty-seven billion, nine hundred ninety-two million, five hundred ninety-one thousand, eighty-one".