27889492091 has 4 divisors (see below), whose sum is σ = 28225510152. Its totient is φ = 27553474032.

The previous prime is 27889492087. The next prime is 27889492097. The reversal of 27889492091 is 19029498872.

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 27889492091 - 2² = 27889492087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27889492091.

It is not an unprimeable number, because it can be changed into a prime (27889492097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168008906 + ... + 168009071.

It is an arithmetic number, because the mean of its divisors is an integer number (7056377538).

Almost surely, 2^27889492091 is an apocalyptic number.

27889492091 is a deficient number, since it is larger than the sum of its proper divisors (336018061).

27889492091 is an equidigital number, since it uses as much as digits as its factorization.

27889492091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336018060.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 27889492091 in words is "twenty-seven billion, eight hundred eighty-nine million, four hundred ninety-two thousand, ninety-one".