91860640 has 96 divisors (see below), whose sum is σ = 227525760. Its totient is φ = 35011584.

The previous prime is 91860631. The next prime is 91860641. The reversal of 91860640 is 4606819.

It is a junction number, because it is equal to n+sod(n) for n = 91860596 and 91860605.

It is not an unprimeable number, because it can be changed into a prime (91860641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349149 + ... + 349411.

It is an arithmetic number, because the mean of its divisors is an integer number (2370060).

Almost surely, 2^91860640 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 91860640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113762880).

91860640 is an abundant number, since it is smaller than the sum of its proper divisors (135665120).

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

91860640 is a wasteful number, since it uses less digits than its factorization.

91860640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 91860640 is about 9584.3956512657. The cubic root of 91860640 is about 451.2076860183.

The spelling of 91860640 in words is "ninety-one million, eight hundred sixty thousand, six hundred forty".