27890636399 has 2 divisors, whose sum is σ = 27890636400. Its totient is φ = 27890636398.

The previous prime is 27890636387. The next prime is 27890636401. The reversal of 27890636399 is 99363609872.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27890636399 is a prime.

Together with 27890636401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27890636359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945318199 + 13945318200.

It is an arithmetic number, because the mean of its divisors is an integer number (13945318200).

Almost surely, 2^27890636399 is an apocalyptic number.

27890636399 is a deficient number, since it is larger than the sum of its proper divisors (1).

27890636399 is an equidigital number, since it uses as much as digits as its factorization.

27890636399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26453952, while the sum is 62.

The spelling of 27890636399 in words is "twenty-seven billion, eight hundred ninety million, six hundred thirty-six thousand, three hundred ninety-nine".