990043566 has 8 divisors (see below), whose sum is σ = 1980087144. Its totient is φ = 330014520.

The previous prime is 990043547. The next prime is 990043577. The reversal of 990043566 is 665340099.

It is a sphenic number, since it is the product of 3 distinct primes.

990043566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82503625 + ... + 82503636.

It is an arithmetic number, because the mean of its divisors is an integer number (247510893).

Almost surely, 2^990043566 is an apocalyptic number.

990043566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

990043566 is a wasteful number, since it uses less digits than its factorization.

990043566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165007266.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 990043566 is about 31464.9577466743. The cubic root of 990043566 is about 996.6701128255.

The spelling of 990043566 in words is "nine hundred ninety million, forty-three thousand, five hundred sixty-six".