9000090 has 48 divisors (see below), whose sum is σ = 25530336. Its totient is φ = 2181600.

The previous prime is 9000067. The next prime is 9000119. The reversal of 9000090 is 900009.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

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, 3556 + ... + 5535.

It is an arithmetic number, because the mean of its divisors is an integer number (531882).

Almost surely, 2^9000090 is an apocalyptic number.

9000090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9000090 is an abundant number, since it is smaller than the sum of its proper divisors (16530246).

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

9000090 is a wasteful number, since it uses less digits than its factorization.

9000090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115 (or 9112 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 9000090 is about 3000.0149999625. The cubic root of 9000090 is about 208.0090756642.

9000090 divided by its sum of digits (18) gives a palindrome (500005).

Subtracting from 9000090 its product of nonzero digits (81), we obtain a palindrome (9000009).

Adding to 9000090 its reverse (900009), we get a palindrome (9900099).

The spelling of 9000090 in words is "nine million, ninety", and thus it is an aban number and an uban number.