91940600640 has 224 divisors, whose sum is σ = 337634519040. Its totient is φ = 20761675776.

The previous prime is 91940600603. The next prime is 91940600669. The reversal of 91940600640 is 4600604919.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475341 + ... + 640179.

It is an arithmetic number, because the mean of its divisors is an integer number (1507296960).

Almost surely, 2^91940600640 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 91940600640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168817259520).

91940600640 is an abundant number, since it is smaller than the sum of its proper divisors (245693918400).

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

91940600640 is a wasteful number, since it uses less digits than its factorization.

91940600640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164949 (or 164939 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 91940600640 in words is "ninety-one billion, nine hundred forty million, six hundred thousand, six hundred forty".