99809236800 has 2268 divisors, whose sum is σ = 478346633856. Its totient is φ = 20379340800.

The previous prime is 99809236781. The next prime is 99809236837. The reversal of 99809236800 is 863290899.

It is a tau number, because it is divible by the number of its divisors (2268).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 323 ways as a sum of consecutive naturals, for example, 3219652785 + ... + 3219652815.

Almost surely, 2^99809236800 is an apocalyptic number.

99809236800 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 99809236800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239173316928).

99809236800 is an abundant number, since it is smaller than the sum of its proper divisors (378537397056).

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

99809236800 is a wasteful number, since it uses less digits than its factorization.

99809236800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 99809236800 in words is "ninety-nine billion, eight hundred nine million, two hundred thirty-six thousand, eight hundred".