91885978008 has 216 divisors, whose sum is σ = 277054164660. Its totient is φ = 27490795200.

The previous prime is 91885977947. The next prime is 91885978021. The reversal of 91885978008 is 80087958819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 60016203 + ... + 60017733.

Almost surely, 2^91885978008 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 91885978008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138527082330).

91885978008 is an abundant number, since it is smaller than the sum of its proper divisors (185168186652).

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

91885978008 is a wasteful number, since it uses less digits than its factorization.

91885978008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 63.

The spelling of 91885978008 in words is "ninety-one billion, eight hundred eighty-five million, nine hundred seventy-eight thousand, eight".