27731840879 has 2 divisors, whose sum is σ = 27731840880. Its totient is φ = 27731840878.

The previous prime is 27731840867. The next prime is 27731840897. The reversal of 27731840879 is 97804813772.

It is a happy number.

Together with next prime (27731840897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27731840879 - 2¹⁶ = 27731775343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27734840879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865920439 + 13865920440.

It is an arithmetic number, because the mean of its divisors is an integer number (13865920440).

Almost surely, 2^27731840879 is an apocalyptic number.

27731840879 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731840879 is an equidigital number, since it uses as much as digits as its factorization.

27731840879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 27731840879 in words is "twenty-seven billion, seven hundred thirty-one million, eight hundred forty thousand, eight hundred seventy-nine".