99789511680 has 440 divisors, whose sum is σ = 362732657760. Its totient is φ = 26227998720.

The previous prime is 99789511651. The next prime is 99789511691. The reversal of 99789511680 is 8611598799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29443426 + ... + 29446814.

It is an arithmetic number, because the mean of its divisors is an integer number (824392404).

Almost surely, 2^99789511680 is an apocalyptic number.

99789511680 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99789511680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181366328880).

99789511680 is an abundant number, since it is smaller than the sum of its proper divisors (262943146080).

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

99789511680 is a wasteful number, since it uses less digits than its factorization.

99789511680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497 (or 3470 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 99789511680 in words is "ninety-nine billion, seven hundred eighty-nine million, five hundred eleven thousand, six hundred eighty".