91481437320 has 384 divisors, whose sum is σ = 346885079040. Its totient is φ = 18889528320.

The previous prime is 91481437303. The next prime is 91481437349. The reversal of 91481437320 is 2373418419.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6665265 + ... + 6678975.

It is an arithmetic number, because the mean of its divisors is an integer number (903346560).

Almost surely, 2^91481437320 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 91481437320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173442539520).

91481437320 is an abundant number, since it is smaller than the sum of its proper divisors (255403641720).

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

91481437320 is a wasteful number, since it uses less digits than its factorization.

91481437320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13805 (or 13788 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 91481437320 in words is "ninety-one billion, four hundred eighty-one million, four hundred thirty-seven thousand, three hundred twenty".