990681904 has 10 divisors (see below), whose sum is σ = 1919446220. Its totient is φ = 495340944.

The previous prime is 990681841. The next prime is 990681947. The reversal of 990681904 is 409186099.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30958794 + ... + 30958825.

It is an arithmetic number, because the mean of its divisors is an integer number (191944622).

Almost surely, 2^990681904 is an apocalyptic number.

It is an amenable number.

990681904 is a deficient number, since it is larger than the sum of its proper divisors (928764316).

990681904 is a wasteful number, since it uses less digits than its factorization.

990681904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61917627 (or 61917621 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 990681904 is about 31475.0997456720. The cubic root of 990681904 is about 996.8842703108.

The spelling of 990681904 in words is "nine hundred ninety million, six hundred eighty-one thousand, nine hundred four".