996660 has 108 divisors (see below), whose sum is σ = 3547908. Its totient is φ = 225792.

The previous prime is 996649. The next prime is 996689. The reversal of 996660 is 66699.

It can be written as a sum of positive squares in 2 ways, for example, as 142884 + 853776 = 378^2 + 924^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 996660.

It is an unprimeable 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 35 ways as a sum of consecutive naturals, for example, 8764 + ... + 8876.

It is an arithmetic number, because the mean of its divisors is an integer number (32851).

2⁹⁹⁶⁶⁶⁰ is an apocalyptic number.

996660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 996660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773954).

996660 is an abundant number, since it is smaller than the sum of its proper divisors (2551248).

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

996660 is a wasteful number, since it uses less digits than its factorization.

996660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 996660 is about 998.3286032164. The cubic root of 996660 is about 99.8885424850. Note that the first 3 decimals are identical.

It can be divided in two parts, 9 and 96660, that added together give a palindrome (96669).

The spelling of 996660 in words is "nine hundred ninety-six thousand, six hundred sixty".