27432947691 has 12 divisors (see below), whose sum is σ = 39627653832. Its totient is φ = 18287577216.

The previous prime is 27432947623. The next prime is 27432947699. The reversal of 27432947691 is 19674923472.

27432947691 is a `hidden beast` number, since 27 + 43 + 29 + 476 + 91 = 666.

It is not a de Polignac number, because 27432947691 - 2¹⁵ = 27432914923 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (27432947699) 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 11 ways as a sum of consecutive naturals, for example, 97435 + ... + 253691.

It is an arithmetic number, because the mean of its divisors is an integer number (3302304486).

Almost surely, 2^27432947691 is an apocalyptic number.

27432947691 is a deficient number, since it is larger than the sum of its proper divisors (12194706141).

27432947691 is a wasteful number, since it uses less digits than its factorization.

27432947691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175770 (or 175767 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 27432947691 in words is "twenty-seven billion, four hundred thirty-two million, nine hundred forty-seven thousand, six hundred ninety-one".