91640765402088 has 256 divisors, whose sum is σ = 272096024739840. Its totient is φ = 25168436121600.

The previous prime is 91640765402077. The next prime is 91640765402113. The reversal of 91640765402088 is 88020456704619.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 511810018 + ... + 511989038.

It is an arithmetic number, because the mean of its divisors is an integer number (1062875096640).

Almost surely, 2^{91640765402088} 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 91640765402088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136048012369920).

91640765402088 is an abundant number, since it is smaller than the sum of its proper divisors (180455259337752).

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

91640765402088 is a wasteful number, since it uses less digits than its factorization.

91640765402088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179728 (or 179724 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 91640765402088 in words is "ninety-one trillion, six hundred forty billion, seven hundred sixty-five million, four hundred two thousand, eighty-eight".