91026788856 has 64 divisors (see below), whose sum is σ = 249959174400. Its totient is φ = 27495502848.

The previous prime is 91026788843. The next prime is 91026788857. The reversal of 91026788856 is 65888762019.

It is a self number, because there is not a number n which added to its sum of digits gives 91026788856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91026788857) 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 15 ways as a sum of consecutive naturals, for example, 4329081 + ... + 4350056.

It is an arithmetic number, because the mean of its divisors is an integer number (3905612100).

Almost surely, 2^91026788856 is an apocalyptic number.

It is an amenable number.

91026788856 is an abundant number, since it is smaller than the sum of its proper divisors (158932385544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91026788856 is a wasteful number, since it uses less digits than its factorization.

91026788856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679188 (or 8679184 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 91026788856 in words is "ninety-one billion, twenty-six million, seven hundred eighty-eight thousand, eight hundred fifty-six".