9090990908 has 12 divisors (see below), whose sum is σ = 15916714632. Its totient is φ = 4543358160.

The previous prime is 9090990893. The next prime is 9090990929. The reversal of 9090990908 is 8090990909.

It is a happy number.

It is a super-2 number, since 2×9090990908² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9090990908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524735 + ... + 541782.

It is an arithmetic number, because the mean of its divisors is an integer number (1326392886).

Almost surely, 2^9090990908 is an apocalyptic number.

It is an amenable number.

9090990908 is a deficient number, since it is larger than the sum of its proper divisors (6825723724).

9090990908 is a wasteful number, since it uses less digits than its factorization.

9090990908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068652 (or 1068650 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9090990908 is about 95346.6879760383. The cubic root of 9090990908 is about 2087.0702835130.

Subtracting from 9090990908 its reverse (8090990909), we obtain a palindrome (999999999).

The spelling of 9090990908 in words is "nine billion, ninety million, nine hundred ninety thousand, nine hundred eight".