99989910 has 64 divisors (see below), whose sum is σ = 273873600. Its totient is φ = 25940736.

The previous prime is 99989909. The next prime is 99989963. The reversal of 99989910 is 1998999.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4986 + ... + 14994.

It is an arithmetic number, because the mean of its divisors is an integer number (4279275).

Almost surely, 2^99989910 is an apocalyptic number.

99989910 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99989910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136936800).

99989910 is an abundant number, since it is smaller than the sum of its proper divisors (173883690).

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

99989910 is a wasteful number, since it uses less digits than its factorization.

99989910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10062 (or 10056 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 99989910 is about 9999.4954872733. The cubic root of 99989910 is about 464.1432716257.

It can be divided in two parts, 999 and 89910, that added together give a palindrome (90909).

The spelling of 99989910 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred ten".