99809928 has 64 divisors (see below), whose sum is σ = 278956800. Its totient is φ = 33065280.

The previous prime is 99809911. The next prime is 99809933. The reversal of 99809928 is 82990899.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36033 + ... + 38703.

It is an arithmetic number, because the mean of its divisors is an integer number (4358700).

Almost surely, 2^99809928 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 99809928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139478400).

99809928 is an abundant number, since it is smaller than the sum of its proper divisors (179146872).

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

99809928 is a wasteful number, since it uses less digits than its factorization.

99809928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859 (or 2849 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 99809928 is about 9990.4918797825. The cubic root of 99809928 is about 463.8646181529.

The spelling of 99809928 in words is "ninety-nine million, eight hundred nine thousand, nine hundred twenty-eight".