990975880 has 16 divisors (see below), whose sum is σ = 2229695820. Its totient is φ = 396390336.

The previous prime is 990975877. The next prime is 990975983. The reversal of 990975880 is 88579099.

It can be written as a sum of positive squares in 2 ways, for example, as 975812644 + 15163236 = 31238^2 + 3894^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12387159 + ... + 12387238.

Almost surely, 2^990975880 is an apocalyptic number.

It is an amenable number.

990975880 is an abundant number, since it is smaller than the sum of its proper divisors (1238719940).

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

990975880 is a wasteful number, since it uses less digits than its factorization.

990975880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24774408 (or 24774404 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 990975880 is about 31479.7693765377. The cubic root of 990975880 is about 996.9828660579.

The spelling of 990975880 in words is "nine hundred ninety million, nine hundred seventy-five thousand, eight hundred eighty".