990815886 has 48 divisors (see below), whose sum is σ = 2174172000. Its totient is φ = 326078784.

The previous prime is 990815869. The next prime is 990815927. The reversal of 990815886 is 688518099.

It is a super-2 number, since 2×990815886² = 1963432239899929992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 684015 + ... + 685461.

It is an arithmetic number, because the mean of its divisors is an integer number (45295250).

Almost surely, 2^990815886 is an apocalyptic number.

990815886 is an abundant number, since it is smaller than the sum of its proper divisors (1183356114).

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

990815886 is a wasteful number, since it uses less digits than its factorization.

990815886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1910 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 990815886 is about 31477.2280545794. The cubic root of 990815886 is about 996.9292085589.

The spelling of 990815886 in words is "nine hundred ninety million, eight hundred fifteen thousand, eight hundred eighty-six".