9909990890 has 16 divisors (see below), whose sum is σ = 18217516032. Its totient is φ = 3879655824.

The previous prime is 9909990889. The next prime is 9909990953. The reversal of 9909990890 is 980999099.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10542074 + ... + 10543013.

It is an arithmetic number, because the mean of its divisors is an integer number (1138594752).

Almost surely, 2^9909990890 is an apocalyptic number.

9909990890 is a deficient number, since it is larger than the sum of its proper divisors (8307525142).

9909990890 is a wasteful number, since it uses less digits than its factorization.

9909990890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21085141.

The product of its (nonzero) digits is 4251528, while the sum is 62.

The square root of 9909990890 is about 99548.9371615790. The cubic root of 9909990890 is about 2147.9512403292.

The spelling of 9909990890 in words is "nine billion, nine hundred nine million, nine hundred ninety thousand, eight hundred ninety".