1000664 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 422304.

The previous prime is 1000651. The next prime is 1000667. The reversal of 1000664 is 4660001.

1000664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000667) 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, 5909 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1000664 is an apocalyptic number.

1000664 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 1000664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

1000664 is an abundant number, since it is smaller than the sum of its proper divisors (1176616).

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

1000664 is a wasteful number, since it uses less digits than its factorization.

1000664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1000664 is about 1000.3319449063. The cubic root of 1000664 is about 100.0221284363.

Adding to 1000664 its reverse (4660001), we get a palindrome (5660665).

The spelling of 1000664 in words is "one million, six hundred sixty-four", and thus it is an aban number.