27634691389 has 2 divisors, whose sum is σ = 27634691390. Its totient is φ = 27634691388.

The previous prime is 27634691353. The next prime is 27634691407. The reversal of 27634691389 is 98319643672.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24497571289 + 3137120100 = 156517^2 + 56010^2 .

It is a cyclic number.

It is not a de Polignac number, because 27634691389 - 2¹⁹ = 27634167101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27634601389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13817345694 + 13817345695.

It is an arithmetic number, because the mean of its divisors is an integer number (13817345695).

Almost surely, 2^27634691389 is an apocalyptic number.

It is an amenable number.

27634691389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27634691389 is an equidigital number, since it uses as much as digits as its factorization.

27634691389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 58.

The spelling of 27634691389 in words is "twenty-seven billion, six hundred thirty-four million, six hundred ninety-one thousand, three hundred eighty-nine".