27984086891 has 2 divisors, whose sum is σ = 27984086892. Its totient is φ = 27984086890.

The previous prime is 27984086887. The next prime is 27984086983. The reversal of 27984086891 is 19868048972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27984086891 - 2² = 27984086887 is a prime.

It is not a weakly prime, because it can be changed into another prime (27984086861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13992043445 + 13992043446.

It is an arithmetic number, because the mean of its divisors is an integer number (13992043446).

Almost surely, 2^27984086891 is an apocalyptic number.

27984086891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27984086891 is an equidigital number, since it uses as much as digits as its factorization.

27984086891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 27984086891 in words is "twenty-seven billion, nine hundred eighty-four million, eighty-six thousand, eight hundred ninety-one".