1320664 has 8 divisors (see below), whose sum is σ = 2476260. Its totient is φ = 660328.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320664 is 4660231.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82534 + ... + 82549.

2^1320664 is an apocalyptic number.

It is an amenable number.

1320664 is a deficient number, since it is larger than the sum of its proper divisors (1155596).

1320664 is a wasteful number, since it uses less digits than its factorization.

1320664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165089 (or 165085 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1320664 is about 1149.2014618856. The cubic root of 1320664 is about 109.7145214580.

Adding to 1320664 its reverse (4660231), we get a palindrome (5980895).

The spelling of 1320664 in words is "one million, three hundred twenty thousand, six hundred sixty-four".