91227976320 has 256 divisors, whose sum is σ = 314296174080. Its totient is φ = 22374481920.

The previous prime is 91227976309. The next prime is 91227976327. The reversal of 91227976320 is 2367972219.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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 91227976320.

It is not an unprimeable number, because it can be changed into a prime (91227976327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7007257 + ... + 7020263.

It is an arithmetic number, because the mean of its divisors is an integer number (1227719430).

Almost surely, 2^91227976320 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 91227976320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157148087040).

91227976320 is an abundant number, since it is smaller than the sum of its proper divisors (223068197760).

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

91227976320 is a wasteful number, since it uses less digits than its factorization.

91227976320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323 (or 13311 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 48.

The spelling of 91227976320 in words is "ninety-one billion, two hundred twenty-seven million, nine hundred seventy-six thousand, three hundred twenty".