99090000 has 200 divisors, whose sum is σ = 356385920. Its totient is φ = 26352000.

The previous prime is 99089987. The next prime is 99090001. The reversal of 99090000 is 9099.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99090001) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 269817 + ... + 270183.

Almost surely, 2^99090000 is an apocalyptic number.

99090000 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 99090000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178192960).

99090000 is an abundant number, since it is smaller than the sum of its proper divisors (257295920).

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

99090000 is a wasteful number, since it uses less digits than its factorization.

99090000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 99090000 is about 9954.3960138222. The cubic root of 99090000 is about 462.7466422479.

Adding to 99090000 its reverse (9099), we get a palindrome (99099099).

The spelling of 99090000 in words is "ninety-nine million, ninety thousand".