990189728 has 24 divisors (see below), whose sum is σ = 2126658240. Its totient is φ = 450086080.

The previous prime is 990189727. The next prime is 990189757. The reversal of 990189728 is 827981099.

It is a self number, because there is not a number n which added to its sum of digits gives 990189728.

It is not an unprimeable number, because it can be changed into a prime (990189727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406168 + ... + 1406871.

It is an arithmetic number, because the mean of its divisors is an integer number (88610760).

Almost surely, 2^990189728 is an apocalyptic number.

It is an amenable number.

990189728 is an abundant number, since it is smaller than the sum of its proper divisors (1136468512).

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

990189728 is a wasteful number, since it uses less digits than its factorization.

990189728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813060 (or 2813052 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 990189728 is about 31467.2802765031. The cubic root of 990189728 is about 996.7191571753.

The spelling of 990189728 in words is "nine hundred ninety million, one hundred eighty-nine thousand, seven hundred twenty-eight".