78027088591 has 4 divisors (see below), whose sum is σ = 78040407384. Its totient is φ = 78013769800.

The previous prime is 78027088523. The next prime is 78027088619. The reversal of 78027088591 is 19588072087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19588072087 = 69821 ⋅280547.

It is a cyclic number.

It is not a de Polignac number, because 78027088591 - 2⁷ = 78027088463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78027388591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6650605 + ... + 6662326.

It is an arithmetic number, because the mean of its divisors is an integer number (19510101846).

Almost surely, 2^78027088591 is an apocalyptic number.

78027088591 is a deficient number, since it is larger than the sum of its proper divisors (13318793).

78027088591 is a wasteful number, since it uses less digits than its factorization.

78027088591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13318792.

The product of its (nonzero) digits is 2257920, while the sum is 55.

The spelling of 78027088591 in words is "seventy-eight billion, twenty-seven million, eighty-eight thousand, five hundred ninety-one".