8991896120928 has 384 divisors, whose sum is σ = 30550434647040. Its totient is φ = 2519655690240.

The previous prime is 8991896120903. The next prime is 8991896120993. The reversal of 8991896120928 is 8290216981998.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 1311342076 + ... + 1311348932.

It is an arithmetic number, because the mean of its divisors is an integer number (79558423560).

Almost surely, 2^{8991896120928} 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 8991896120928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15275217323520).

8991896120928 is an abundant number, since it is smaller than the sum of its proper divisors (21558538526112).

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

8991896120928 is a wasteful number, since it uses less digits than its factorization.

8991896120928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11027 (or 11013 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 72.

The spelling of 8991896120928 in words is "eight trillion, nine hundred ninety-one billion, eight hundred ninety-six million, one hundred twenty thousand, nine hundred twenty-eight".