900000008 has 16 divisors (see below), whose sum is σ = 1687824060. Its totient is φ = 449913600.

The previous prime is 899999963. The next prime is 900000011. The reversal of 900000008 is 800000009.

It can be written as a sum of positive squares in 2 ways, for example, as 838565764 + 61434244 = 28958^2 + 7838^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63668 + ... + 76508.

Almost surely, 2^900000008 is an apocalyptic number.

It is an amenable number.

900000008 is a deficient number, since it is larger than the sum of its proper divisors (787824052).

900000008 is a wasteful number, since it uses less digits than its factorization.

900000008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21608 (or 21604 counting only the distinct ones).

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

The square root of 900000008 is about 30000.0001333333. Note that the first 3 decimals coincide. The cubic root of 900000008 is about 965.4893874663.

Subtracting from 900000008 its reverse (800000009), we obtain a palindrome (99999999).

The spelling of 900000008 in words is "nine hundred million, eight", and thus it is an aban number.