990816808 has 8 divisors (see below), whose sum is σ = 1857781530. Its totient is φ = 495408400.

The previous prime is 990816791. The next prime is 990816829. The reversal of 990816808 is 808618099.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 925498084 + 65318724 = 30422^2 + 8082^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61926043 + ... + 61926058.

Almost surely, 2^990816808 is an apocalyptic number.

It is an amenable number.

990816808 is a deficient number, since it is larger than the sum of its proper divisors (866964722).

990816808 is a wasteful number, since it uses less digits than its factorization.

990816808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123852107 (or 123852103 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 990816808 is about 31477.2427000841. The cubic root of 990816808 is about 996.9295177883.

The spelling of 990816808 in words is "nine hundred ninety million, eight hundred sixteen thousand, eight hundred eight".