91621067328 has 560 divisors, whose sum is σ = 322473913344. Its totient is φ = 25178065920.

The previous prime is 91621067327. The next prime is 91621067353. The reversal of 91621067328 is 82376012619.

It is not an unprimeable number, because it can be changed into a prime (91621067327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 110786851 + ... + 110787677.

Almost surely, 2^91621067328 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 91621067328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161236956672).

91621067328 is an abundant number, since it is smaller than the sum of its proper divisors (230852846016).

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

91621067328 is a wasteful number, since it uses less digits than its factorization.

91621067328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 91621067328 in words is "ninety-one billion, six hundred twenty-one million, sixty-seven thousand, three hundred twenty-eight".