1630664 has 32 divisors (see below), whose sum is σ = 3593280. Its totient is φ = 679104.

The previous prime is 1630663. The next prime is 1630669. The reversal of 1630664 is 4660361.

It is not an unprimeable number, because it can be changed into a prime (1630663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679 + ... + 2465.

It is an arithmetic number, because the mean of its divisors is an integer number (112290).

2^1630664 is an apocalyptic number.

1630664 is a gapful number since it is divisible by the number (14) 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 1630664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796640).

1630664 is an abundant number, since it is smaller than the sum of its proper divisors (1962616).

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

1630664 is a wasteful number, since it uses less digits than its factorization.

1630664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1630664 is about 1276.9745494723. The cubic root of 1630664 is about 117.7031704491.

The spelling of 1630664 in words is "one million, six hundred thirty thousand, six hundred sixty-four".