99999999000 has 768 divisors, whose sum is σ = 380234424960. Its totient is φ = 23500800000.

The previous prime is 99999998993. The next prime is 99999999019. The reversal of 99999999000 is 99999999.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999999000.

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 191 ways as a sum of consecutive naturals, for example, 729926932 + ... + 729927068.

Almost surely, 2^99999999000 is an apocalyptic number.

99999999000 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 99999999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190117212480).

99999999000 is an abundant number, since it is smaller than the sum of its proper divisors (280234425960).

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

99999999000 is a wasteful number, since it uses less digits than its factorization.

99999999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 43046721, while the sum is 72.

99999999000 divided by its reverse (99999999) gives a cube (1000 = 10³).

It can be divided in two parts, 999 and 99999000, that added together give a palindrome (99999999).

The spelling of 99999999000 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand".