91605193680 has 640 divisors, whose sum is σ = 385311338496. Its totient is φ = 17385062400.

The previous prime is 91605193679. The next prime is 91605193723. The reversal of 91605193680 is 8639150619.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23301315 + ... + 23305245.

Almost surely, 2^91605193680 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 91605193680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192655669248).

91605193680 is an abundant number, since it is smaller than the sum of its proper divisors (293706144816).

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

91605193680 is a wasteful number, since it uses less digits than its factorization.

91605193680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075 (or 4069 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 91605193680 in words is "ninety-one billion, six hundred five million, one hundred ninety-three thousand, six hundred eighty".