91340835840 has 440 divisors, whose sum is σ = 332950772880. Its totient is φ = 23938301952.

The previous prime is 91340835787. The next prime is 91340835851. The reversal of 91340835840 is 4853804319.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 24466614 + ... + 24470346.

It is an arithmetic number, because the mean of its divisors is an integer number (756706302).

Almost surely, 2^91340835840 is an apocalyptic number.

91340835840 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 91340835840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166475386440).

91340835840 is an abundant number, since it is smaller than the sum of its proper divisors (241609937040).

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

91340835840 is a wasteful number, since it uses less digits than its factorization.

91340835840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829 (or 3802 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 91340835840 in words is "ninety-one billion, three hundred forty million, eight hundred thirty-five thousand, eight hundred forty".