91332868788 has 192 divisors, whose sum is σ = 273800056320. Its totient is φ = 25789446144.

The previous prime is 91332868787. The next prime is 91332868793. The reversal of 91332868788 is 88786823319.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91332868787) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33913570 + ... + 33916262.

It is an arithmetic number, because the mean of its divisors is an integer number (1426041960).

Almost surely, 2^91332868788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91332868788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136900028160).

91332868788 is an abundant number, since it is smaller than the sum of its proper divisors (182467187532).

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

91332868788 is a wasteful number, since it uses less digits than its factorization.

91332868788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223 (or 3215 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 91332868788 in words is "ninety-one billion, three hundred thirty-two million, eight hundred sixty-eight thousand, seven hundred eighty-eight".