91026764988 has 12 divisors (see below), whose sum is σ = 212395785000. Its totient is φ = 30342254992.

The previous prime is 91026764953. The next prime is 91026765001. The reversal of 91026764988 is 88946762019.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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, 3792781863 + ... + 3792781886.

It is an arithmetic number, because the mean of its divisors is an integer number (17699648750).

Almost surely, 2^91026764988 is an apocalyptic number.

It is an amenable number.

91026764988 is an abundant number, since it is smaller than the sum of its proper divisors (121369020012).

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

91026764988 is a wasteful number, since it uses less digits than its factorization.

91026764988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585563756 (or 7585563754 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 91026764988 in words is "ninety-one billion, twenty-six million, seven hundred sixty-four thousand, nine hundred eighty-eight".