27971395423 has 4 divisors (see below), whose sum is σ = 27972089728. Its totient is φ = 27970701120.

The previous prime is 27971395411. The next prime is 27971395447. The reversal of 27971395423 is 32459317972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27971395423 - 2⁵ = 27971395391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27971395453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282738 + ... + 368623.

It is an arithmetic number, because the mean of its divisors is an integer number (6993022432).

Almost surely, 2^27971395423 is an apocalyptic number.

27971395423 is a deficient number, since it is larger than the sum of its proper divisors (694305).

27971395423 is an equidigital number, since it uses as much as digits as its factorization.

27971395423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694304.

The product of its digits is 2857680, while the sum is 52.

The spelling of 27971395423 in words is "twenty-seven billion, nine hundred seventy-one million, three hundred ninety-five thousand, four hundred twenty-three".