91863713040 has 240 divisors, whose sum is σ = 326631844224. Its totient is φ = 21301575680.

The previous prime is 91863712951. The next prime is 91863713057. The reversal of 91863713040 is 4031736819.

It is a tau number, because it is divible by the number of its divisors (240).

It is a junction number, because it is equal to n+sod(n) for n = 91863712983 and 91863713001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 599152 + ... + 736688.

Almost surely, 2^91863713040 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 91863713040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163315922112).

91863713040 is an abundant number, since it is smaller than the sum of its proper divisors (234768131184).

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

91863713040 is a wasteful number, since it uses less digits than its factorization.

91863713040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137598 (or 137581 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 91863713040 in words is "ninety-one billion, eight hundred sixty-three million, seven hundred thirteen thousand, forty".