90009906 has 16 divisors (see below), whose sum is σ = 205737024. Its totient is φ = 25717104.

The previous prime is 90009901. The next prime is 90009919. The reversal of 90009906 is 60990009.

It is not an unprimeable number, because it can be changed into a prime (90009901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071505 + ... + 1071588.

It is an arithmetic number, because the mean of its divisors is an integer number (12858564).

Almost surely, 2^90009906 is an apocalyptic number.

90009906 is an abundant number, since it is smaller than the sum of its proper divisors (115727118).

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

90009906 is a wasteful number, since it uses less digits than its factorization.

90009906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143105.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 90009906 is about 9487.3550581814. The cubic root of 90009906 is about 448.1569158286.

The spelling of 90009906 in words is "ninety million, nine thousand, nine hundred six".