99799777792 has 240 divisors, whose sum is σ = 244236789720. Its totient is φ = 40420638720.

The previous prime is 99799777789. The next prime is 99799777793. The reversal of 99799777792 is 29777799799.

It can be written as a sum of positive squares in 4 ways, for example, as 58905231616 + 40894546176 = 242704^2 + 202224^2 .

It is not an unprimeable number, because it can be changed into a prime (99799777793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23353768 + ... + 23358040.

Almost surely, 2^99799777792 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 99799777792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122118394860).

99799777792 is an abundant number, since it is smaller than the sum of its proper divisors (144437011928).

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

99799777792 is a wasteful number, since it uses less digits than its factorization.

99799777792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355 (or 4328 counting only the distinct ones).

The product of its digits is 1984873086, while the sum is 82.

The spelling of 99799777792 in words is "ninety-nine billion, seven hundred ninety-nine million, seven hundred seventy-seven thousand, seven hundred ninety-two".