99640800 has 288 divisors, whose sum is σ = 412473600. Its totient is φ = 22740480.

The previous prime is 99640787. The next prime is 99640811. The reversal of 99640800 is 804699.

99640800 is a `hidden beast` number, since 9 + 9 + 640 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150871 + ... + 151529.

It is an arithmetic number, because the mean of its divisors is an integer number (1432200).

Almost surely, 2^99640800 is an apocalyptic number.

99640800 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 99640800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206236800).

99640800 is an abundant number, since it is smaller than the sum of its proper divisors (312832800).

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

99640800 is a wasteful number, since it uses less digits than its factorization.

99640800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 99640800 is about 9982.0238428888. The cubic root of 99640800 is about 463.6024637057.

The spelling of 99640800 in words is "ninety-nine million, six hundred forty thousand, eight hundred".