990635660 has 24 divisors (see below), whose sum is σ = 2377525920. Its totient is φ = 339646464.

The previous prime is 990635647. The next prime is 990635671. The reversal of 990635660 is 66536099.

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, 3537845 + ... + 3538124.

It is an arithmetic number, because the mean of its divisors is an integer number (99063580).

Almost surely, 2^990635660 is an apocalyptic number.

It is an amenable number.

990635660 is an abundant number, since it is smaller than the sum of its proper divisors (1386890260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990635660 is a wasteful number, since it uses less digits than its factorization.

990635660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075985 (or 7075983 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 990635660 is about 31474.3651246534. The cubic root of 990635660 is about 996.8687588961.

The spelling of 990635660 in words is "nine hundred ninety million, six hundred thirty-five thousand, six hundred sixty".