91044331504 has 80 divisors (see below), whose sum is σ = 213782763456. Its totient is φ = 36667699200.

The previous prime is 91044331501. The next prime is 91044331519. The reversal of 91044331504 is 40513344019.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 91044331504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91044331501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222374 + ... + 1294714.

Almost surely, 2^91044331504 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 91044331504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106891381728).

91044331504 is an abundant number, since it is smaller than the sum of its proper divisors (122738431952).

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

91044331504 is a wasteful number, since it uses less digits than its factorization.

91044331504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73034 (or 73028 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 91044331504 in words is "ninety-one billion, forty-four million, three hundred thirty-one thousand, five hundred four".