990660 has 96 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 224640.

The previous prime is 990643. The next prime is 990673. The reversal of 990660 is 66099.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

990660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 31 ways as a sum of consecutive naturals, for example, 12501 + ... + 12579.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2⁹⁹⁰⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612800).

990660 is an abundant number, since it is smaller than the sum of its proper divisors (2234940).

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

990660 is a wasteful number, since it uses less digits than its factorization.

990660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 990660 is about 995.3190443270. The cubic root of 990660 is about 99.6876923212.

The spelling of 990660 in words is "nine hundred ninety thousand, six hundred sixty".