99640831200 has 144 divisors (see below), whose sum is σ = 325748994480. Its totient is φ = 26454712320.

The previous prime is 99640831181. The next prime is 99640831207. The reversal of 99640831200 is 213804699.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640831207) 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, 458952 + ... + 640248.

It is an arithmetic number, because the mean of its divisors is an integer number (2262145795).

Almost surely, 2^99640831200 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 99640831200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162874497240).

99640831200 is an abundant number, since it is smaller than the sum of its proper divisors (226108163280).

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

99640831200 is a wasteful number, since it uses less digits than its factorization.

99640831200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181549 (or 181536 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 99640831200 in words is "ninety-nine billion, six hundred forty million, eight hundred thirty-one thousand, two hundred".