27644081931 has 12 divisors (see below), whose sum is σ = 40584937120. Its totient is φ = 18127266480.

The previous prime is 27644081923. The next prime is 27644081947. The reversal of 27644081931 is 13918044672.

It is not a de Polignac number, because 27644081931 - 2³ = 27644081923 is a prime.

It is a super-2 number, since 2×27644081931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27644081921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25176211 + ... + 25177308.

Almost surely, 2^27644081931 is an apocalyptic number.

27644081931 is a deficient number, since it is larger than the sum of its proper divisors (12940855189).

27644081931 is a wasteful number, since it uses less digits than its factorization.

27644081931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50353586 (or 50353583 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 27644081931 in words is "twenty-seven billion, six hundred forty-four million, eighty-one thousand, nine hundred thirty-one".