99988900 has 72 divisors (see below), whose sum is σ = 250671456. Its totient is φ = 34214400.

The previous prime is 99988879. The next prime is 99988913. The reversal of 99988900 is 988999.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16027 + ... + 21373.

It is an arithmetic number, because the mean of its divisors is an integer number (3481548).

Almost surely, 2^99988900 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 99988900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125335728).

99988900 is an abundant number, since it is smaller than the sum of its proper divisors (150682556).

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

99988900 is a wasteful number, since it uses less digits than its factorization.

99988900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5389 (or 5382 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 99988900 is about 9999.4449845979. Note that the first 3 decimals coincide. The cubic root of 99988900 is about 464.1417088471.

The spelling of 99988900 in words is "ninety-nine million, nine hundred eighty-eight thousand, nine hundred".