9909990808 has 16 divisors (see below), whose sum is σ = 18583306560. Its totient is φ = 4954442400.

The previous prime is 9909990781. The next prime is 9909990833. The reversal of 9909990808 is 8080999099.

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, 12738 + ... + 141358.

It is an arithmetic number, because the mean of its divisors is an integer number (1161456660).

Almost surely, 2^9909990808 is an apocalyptic number.

It is an amenable number.

9909990808 is a deficient number, since it is larger than the sum of its proper divisors (8673315752).

9909990808 is a wasteful number, since it uses less digits than its factorization.

9909990808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138258 (or 138254 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 61.

The square root of 9909990808 is about 99548.9367497212. The cubic root of 9909990808 is about 2147.9512344048.

The spelling of 9909990808 in words is "nine billion, nine hundred nine million, nine hundred ninety thousand, eight hundred eight".