99840000000 has 512 divisors, whose sum is σ = 358393613760. Its totient is φ = 24576000000.

The previous prime is 99839999989. The next prime is 99840000031. The reversal of 99840000000 is 4899.

It is a tau number, because it is divible by the number of its divisors (512).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7679999994 + ... + 7680000006.

Almost surely, 2^99840000000 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 99840000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179196806880).

99840000000 is an abundant number, since it is smaller than the sum of its proper divisors (258553613760).

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

99840000000 is an frugal number, since it uses more digits than its factorization.

99840000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 99840000000 its reverse (4899), we get a palindrome (99840004899).

The spelling of 99840000000 in words is "ninety-nine billion, eight hundred forty million", and thus it is an aban number.