91160057940 has 192 divisors, whose sum is σ = 304613277696. Its totient is φ = 19916379648.

The previous prime is 91160057869. The next prime is 91160057959. The reversal of 91160057940 is 4975006119.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 91160057892 and 91160057901.

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, 19056789 + ... + 19061571.

It is an arithmetic number, because the mean of its divisors is an integer number (1586527488).

Almost surely, 2^91160057940 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 91160057940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152306638848).

91160057940 is an abundant number, since it is smaller than the sum of its proper divisors (213453219756).

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

91160057940 is a wasteful number, since it uses less digits than its factorization.

91160057940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6798 (or 6796 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 91160057940 in words is "ninety-one billion, one hundred sixty million, fifty-seven thousand, nine hundred forty".