990570820 has 24 divisors (see below), whose sum is σ = 2082203928. Its totient is φ = 395846400.

The previous prime is 990570817. The next prime is 990570859. The reversal of 990570820 is 28075099.

It can be written as a sum of positive squares in 4 ways, for example, as 481978116 + 508592704 = 21954^2 + 22552^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 2121 + ... + 44560.

It is an arithmetic number, because the mean of its divisors is an integer number (86758497).

Almost surely, 2^990570820 is an apocalyptic number.

It is an amenable number.

990570820 is an abundant number, since it is smaller than the sum of its proper divisors (1091633108).

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

990570820 is a wasteful number, since it uses less digits than its factorization.

990570820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47751 (or 47749 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 990570820 is about 31473.3350631928. The cubic root of 990570820 is about 996.8470090967.

The spelling of 990570820 in words is "nine hundred ninety million, five hundred seventy thousand, eight hundred twenty".