91036306944 has 640 divisors, whose sum is σ = 314069184000. Its totient is φ = 26067640320.

The previous prime is 91036306919. The next prime is 91036306961. The reversal of 91036306944 is 44960363019.

91036306944 is a `hidden beast` number, since 9 + 1 + 0 + 3 + 630 + 6 + 9 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91036306944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 234026302 + ... + 234026690.

It is an arithmetic number, because the mean of its divisors is an integer number (490733100).

Almost surely, 2^91036306944 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 91036306944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157034592000).

91036306944 is an abundant number, since it is smaller than the sum of its proper divisors (223032877056).

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

91036306944 is an equidigital number, since it uses as much as digits as its factorization.

91036306944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 91036306944 in words is "ninety-one billion, thirty-six million, three hundred six thousand, nine hundred forty-four".