91019044080 has 120 divisors (see below), whose sum is σ = 305829742608. Its totient is φ = 24259243008.

The previous prime is 91019044063. The next prime is 91019044091. The reversal of 91019044080 is 8044091019.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 1410604 + ... + 1473716.

Almost surely, 2^91019044080 is an apocalyptic number.

91019044080 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 91019044080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152914871304).

91019044080 is an abundant number, since it is smaller than the sum of its proper divisors (214810698528).

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

91019044080 is a wasteful number, since it uses less digits than its factorization.

91019044080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65135 (or 65126 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 91019044080 in words is "ninety-one billion, nineteen million, forty-four thousand, eighty".