990196128 has 72 divisors (see below), whose sum is σ = 2819351808. Its totient is φ = 329657472.

The previous prime is 990196073. The next prime is 990196147. The reversal of 990196128 is 821691099.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311475 + ... + 314637.

It is an arithmetic number, because the mean of its divisors is an integer number (39157664).

Almost surely, 2^990196128 is an apocalyptic number.

It is an amenable number.

990196128 is an abundant number, since it is smaller than the sum of its proper divisors (1829155680).

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

990196128 is a wasteful number, since it uses less digits than its factorization.

990196128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266 (or 4255 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 990196128 is about 31467.3819692710. The cubic root of 990196128 is about 996.7213045714.

The spelling of 990196128 in words is "nine hundred ninety million, one hundred ninety-six thousand, one hundred twenty-eight".