91073464737640 has 256 divisors, whose sum is σ = 256173788160000. Its totient is φ = 28309377761280.

The previous prime is 91073464737637. The next prime is 91073464737649. The reversal of 91073464737640 is 4673746437019.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91073464737649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3013367569 + ... + 3013397791.

It is an arithmetic number, because the mean of its divisors is an integer number (1000678860000).

Almost surely, 2^{91073464737640} 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 91073464737640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128086894080000).

91073464737640 is an abundant number, since it is smaller than the sum of its proper divisors (165100323422360).

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

91073464737640 is a wasteful number, since it uses less digits than its factorization.

91073464737640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32880 (or 32876 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 61.

The spelling of 91073464737640 in words is "ninety-one trillion, seventy-three billion, four hundred sixty-four million, seven hundred thirty-seven thousand, six hundred forty".