27971243423 has 4 divisors (see below), whose sum is σ = 28024726248. Its totient is φ = 27917760600.

The previous prime is 27971243371. The next prime is 27971243431. The reversal of 27971243423 is 32434217972.

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 27971243423 - 2²² = 27967049119 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 (27971243453) 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, 26740628 + ... + 26741673.

It is an arithmetic number, because the mean of its divisors is an integer number (7006181562).

Almost surely, 2^27971243423 is an apocalyptic number.

27971243423 is a deficient number, since it is larger than the sum of its proper divisors (53482825).

27971243423 is an equidigital number, since it uses as much as digits as its factorization.

27971243423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53482824.

The product of its digits is 508032, while the sum is 44.

The spelling of 27971243423 in words is "twenty-seven billion, nine hundred seventy-one million, two hundred forty-three thousand, four hundred twenty-three".