27642957923 has 4 divisors (see below), whose sum is σ = 31591951920. Its totient is φ = 23693963928.

The previous prime is 27642957919. The next prime is 27642957929. The reversal of 27642957923 is 32975924672.

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 27642957923 - 2² = 27642957919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27642957929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1974496988 + ... + 1974497001.

It is an arithmetic number, because the mean of its divisors is an integer number (7897987980).

Almost surely, 2^27642957923 is an apocalyptic number.

27642957923 is a deficient number, since it is larger than the sum of its proper divisors (3948993997).

27642957923 is an equidigital number, since it uses as much as digits as its factorization.

27642957923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948993996.

The product of its digits is 11430720, while the sum is 56.

The spelling of 27642957923 in words is "twenty-seven billion, six hundred forty-two million, nine hundred fifty-seven thousand, nine hundred twenty-three".