91864140896 has 72 divisors (see below), whose sum is σ = 209256810840. Its totient is φ = 39558689280.

The previous prime is 91864140871. The next prime is 91864140899. The reversal of 91864140896 is 69804146819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91864140899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550781 + ... + 697916.

It is an arithmetic number, because the mean of its divisors is an integer number (2906344595).

Almost surely, 2^91864140896 is an apocalyptic number.

It is an amenable number.

91864140896 is an abundant number, since it is smaller than the sum of its proper divisors (117392669944).

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

91864140896 is a wasteful number, since it uses less digits than its factorization.

91864140896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248748 (or 1248729 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 91864140896 in words is "ninety-one billion, eight hundred sixty-four million, one hundred forty thousand, eight hundred ninety-six".