990475820 has 24 divisors (see below), whose sum is σ = 2082722544. Its totient is φ = 395671616.

The previous prime is 990475813. The next prime is 990475853. The reversal of 990475820 is 28574099.

It is a happy number.

990475820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 16574 + ... + 47493.

It is an arithmetic number, because the mean of its divisors is an integer number (86780106).

Almost surely, 2^990475820 is an apocalyptic number.

It is an amenable number.

990475820 is an abundant number, since it is smaller than the sum of its proper divisors (1092246724).

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

990475820 is a wasteful number, since it uses less digits than its factorization.

990475820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64849 (or 64847 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 990475820 is about 31471.8258129394. The cubic root of 990475820 is about 996.8151407734.

The spelling of 990475820 in words is "nine hundred ninety million, four hundred seventy-five thousand, eight hundred twenty".