91860319720 has 256 divisors, whose sum is σ = 236051988480. Its totient is φ = 31938278400.

The previous prime is 91860319717. The next prime is 91860319729. The reversal of 91860319720 is 2791306819.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91860319729) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 94994677 + ... + 94995643.

It is an arithmetic number, because the mean of its divisors is an integer number (922078080).

Almost surely, 2^91860319720 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 91860319720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118025994240).

91860319720 is an abundant number, since it is smaller than the sum of its proper divisors (144191668760).

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

91860319720 is a wasteful number, since it uses less digits than its factorization.

91860319720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 91860319720 in words is "ninety-one billion, eight hundred sixty million, three hundred nineteen thousand, seven hundred twenty".