99804640 has 72 divisors (see below), whose sum is σ = 255390408. Its totient is φ = 36840960.

The previous prime is 99804611. The next prime is 99804673. The reversal of 99804640 is 4640899.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 99804593 and 99804602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25195 + ... + 28885.

It is an arithmetic number, because the mean of its divisors is an integer number (3547089).

Almost surely, 2^99804640 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 99804640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127695204).

99804640 is an abundant number, since it is smaller than the sum of its proper divisors (155585768).

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

99804640 is a wasteful number, since it uses less digits than its factorization.

99804640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732 (or 3711 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 99804640 is about 9990.2272246431. The cubic root of 99804640 is about 463.8564260506.

The spelling of 99804640 in words is "ninety-nine million, eight hundred four thousand, six hundred forty".