90000000008 has 32 divisors (see below), whose sum is σ = 172978264800. Its totient is φ = 43876146048.

The previous prime is 89999999993. The next prime is 90000000019. The reversal of 90000000008 is 80000000009.

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, 34166 + ... + 425637.

It is an arithmetic number, because the mean of its divisors is an integer number (5405570775).

Almost surely, 2^90000000008 is an apocalyptic number.

It is an amenable number.

90000000008 is a deficient number, since it is larger than the sum of its proper divisors (82978264792).

90000000008 is a wasteful number, since it uses less digits than its factorization.

90000000008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460421 (or 460417 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Subtracting from 90000000008 its reverse (80000000009), we obtain a palindrome (9999999999).

The spelling of 90000000008 in words is "ninety billion, eight", and thus it is an aban number and an uban number.