91449563520 has 512 divisors, whose sum is σ = 347385692160. Its totient is φ = 20022681600.

The previous prime is 91449563507. The next prime is 91449563561. The reversal of 91449563520 is 2536594419.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 91449563520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42912855 + ... + 42914985.

It is an arithmetic number, because the mean of its divisors is an integer number (678487680).

Almost surely, 2^91449563520 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 91449563520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173692846080).

91449563520 is an abundant number, since it is smaller than the sum of its proper divisors (255936128640).

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

91449563520 is a wasteful number, since it uses less digits than its factorization.

91449563520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2282 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 91449563520 in words is "ninety-one billion, four hundred forty-nine million, five hundred sixty-three thousand, five hundred twenty".