91083755520 has 312 divisors, whose sum is σ = 320933798952. Its totient is φ = 23887872000.

The previous prime is 91083755489. The next prime is 91083755537. The reversal of 91083755520 is 2555738019.

91083755520 is a `hidden beast` number, since 9 + 10 + 83 + 7 + 5 + 552 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13897580544 + 77186174976 = 117888^2 + 277824^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 11239470 + ... + 11247570.

It is an arithmetic number, because the mean of its divisors is an integer number (1028633971).

Almost surely, 2^91083755520 is an apocalyptic number.

91083755520 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 91083755520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160466899476).

91083755520 is an abundant number, since it is smaller than the sum of its proper divisors (229850043432).

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

91083755520 is a wasteful number, since it uses less digits than its factorization.

91083755520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197 (or 8172 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 91083755520 in words is "ninety-one billion, eighty-three million, seven hundred fifty-five thousand, five hundred twenty".