91113984000 has 1040 divisors, whose sum is σ = 367979692080. Its totient is φ = 22428057600.

The previous prime is 91113983977. The next prime is 91113984019. The reversal of 91113984000 is 48931119.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 8 ways, for example, as 91097726976 + 16257024 = 301824^2 + 4032^2 .

It is a tau number, because it is divible by the number of its divisors (1040).

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=3120.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7008767994 + ... + 7008768006.

It is an arithmetic number, because the mean of its divisors is an integer number (353826627).

Almost surely, 2^91113984000 is an apocalyptic number.

91113984000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91113984000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183989846040).

91113984000 is an abundant number, since it is smaller than the sum of its proper divisors (276865708080).

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

91113984000 is an frugal number, since it uses more digits than its factorization.

91113984000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 91113984000 in words is "ninety-one billion, one hundred thirteen million, nine hundred eighty-four thousand".