91697909760 has 520 divisors, whose sum is σ = 331681242816. Its totient is φ = 24232919040.

The previous prime is 91697909753. The next prime is 91697909791. The reversal of 91697909760 is 6790979619.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 277032795 + ... + 277033125.

Almost surely, 2^91697909760 is an apocalyptic number.

91697909760 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 91697909760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165840621408).

91697909760 is an abundant number, since it is smaller than the sum of its proper divisors (239983333056).

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

91697909760 is a wasteful number, since it uses less digits than its factorization.

91697909760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 11573604, while the sum is 63.

The spelling of 91697909760 in words is "ninety-one billion, six hundred ninety-seven million, nine hundred nine thousand, seven hundred sixty".