90909090908 has 12 divisors (see below), whose sum is σ = 159093057312. Its totient is φ = 45453931680.

The previous prime is 90909090823. The next prime is 90909090929. The reversal of 90909090908 is 80909090909.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90909090908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408368 + ... + 590408.

It is an arithmetic number, because the mean of its divisors is an integer number (13257754776).

Almost surely, 2^90909090908 is an apocalyptic number.

It is an amenable number.

90909090908 is a deficient number, since it is larger than the sum of its proper divisors (68183966404).

90909090908 is a wasteful number, since it uses less digits than its factorization.

90909090908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306892 (or 306890 counting only the distinct ones).

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

Subtracting from 90909090908 its reverse (80909090909), we obtain a palindrome (9999999999).

The spelling of 90909090908 in words is "ninety billion, nine hundred nine million, ninety thousand, nine hundred eight".