91994594944 has 64 divisors (see below), whose sum is σ = 209596242240. Its totient is φ = 39399100416.

The previous prime is 91994594899. The next prime is 91994594947. The reversal of 91994594944 is 44949549919.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 91994594944.

It is not an unprimeable number, because it can be changed into a prime (91994594947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1294152 + ... + 1363384.

It is an arithmetic number, because the mean of its divisors is an integer number (3274941285).

Almost surely, 2^91994594944 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 91994594944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104798121120).

91994594944 is an abundant number, since it is smaller than the sum of its proper divisors (117601647296).

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

91994594944 is a wasteful number, since it uses less digits than its factorization.

91994594944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70737 (or 70725 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 67.

The spelling of 91994594944 in words is "ninety-one billion, nine hundred ninety-four million, five hundred ninety-four thousand, nine hundred forty-four".