91740340385280 has 880 divisors, whose sum is σ = 340601488216704. Its totient is φ = 23673717227520.

The previous prime is 91740340385273. The next prime is 91740340385297. The reversal of 91740340385280 is 8258304304719.

It is a happy number.

91740340385280 is a `hidden beast` number, since 9 + 1 + 7 + 40 + 3 + 40 + 38 + 528 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 87 ways as a sum of consecutive naturals, for example, 4686118852 + ... + 4686138428.

Almost surely, 2^{91740340385280} is an apocalyptic number.

91740340385280 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 91740340385280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170300744108352).

91740340385280 is an abundant number, since it is smaller than the sum of its proper divisors (248861147831424).

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

91740340385280 is an frugal number, since it uses more digits than its factorization.

91740340385280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19661 (or 19618 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

Adding to 91740340385280 its reverse (8258304304719), we get a palindrome (99998644689999).

The spelling of 91740340385280 in words is "ninety-one trillion, seven hundred forty billion, three hundred forty million, three hundred eighty-five thousand, two hundred eighty".