27694907591 has 64 divisors (see below), whose sum is σ = 33066786816. Its totient is φ = 22986163200.

The previous prime is 27694907573. The next prime is 27694907609. The reversal of 27694907591 is 19570949672.

It is an interprime number because it is at equal distance from previous prime (27694907573) and next prime (27694907609).

It is a de Polignac number, because none of the positive numbers 2^k-27694907591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27694907591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27694907561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40907945 + ... + 40908621.

It is an arithmetic number, because the mean of its divisors is an integer number (516668544).

Almost surely, 2^27694907591 is an apocalyptic number.

27694907591 is a deficient number, since it is larger than the sum of its proper divisors (5371879225).

27694907591 is a wasteful number, since it uses less digits than its factorization.

27694907591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 8573040, while the sum is 59.

The spelling of 27694907591 in words is "twenty-seven billion, six hundred ninety-four million, nine hundred seven thousand, five hundred ninety-one".