27731830639 has 2 divisors, whose sum is σ = 27731830640. Its totient is φ = 27731830638.

The previous prime is 27731830619. The next prime is 27731830661. The reversal of 27731830639 is 93603813772.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27731830639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27731830592 and 27731830601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731830619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865915319 + 13865915320.

It is an arithmetic number, because the mean of its divisors is an integer number (13865915320).

Almost surely, 2^27731830639 is an apocalyptic number.

27731830639 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731830639 is an equidigital number, since it uses as much as digits as its factorization.

27731830639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The spelling of 27731830639 in words is "twenty-seven billion, seven hundred thirty-one million, eight hundred thirty thousand, six hundred thirty-nine".