99840786789120 has 576 divisors, whose sum is σ = 358532796109824. Its totient is φ = 23494025871360.

The previous prime is 99840786789103. The next prime is 99840786789131. The reversal of 99840786789120 is 2198768704899.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2051737590 + ... + 2051786250.

It is an arithmetic number, because the mean of its divisors is an integer number (622452771024).

Almost surely, 2^{99840786789120} 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 99840786789120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179266398054912).

99840786789120 is an abundant number, since it is smaller than the sum of its proper divisors (258692009320704).

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

99840786789120 is a wasteful number, since it uses less digits than its factorization.

99840786789120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50508 (or 50494 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 78.

The spelling of 99840786789120 in words is "ninety-nine trillion, eight hundred forty billion, seven hundred eighty-six million, seven hundred eighty-nine thousand, one hundred twenty".