1606664 has 16 divisors (see below), whose sum is σ = 3029100. Its totient is φ = 798912.

The previous prime is 1606663. The next prime is 1606669. The reversal of 1606664 is 4666061.

It can be written as a sum of positive squares in 2 ways, for example, as 1304164 + 302500 = 1142^2 + 550^2 .

It is not an unprimeable number, because it can be changed into a prime (1606663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394 + ... + 2270.

2^1606664 is an apocalyptic number.

It is an amenable number.

1606664 is a deficient number, since it is larger than the sum of its proper divisors (1422436).

1606664 is a wasteful number, since it uses less digits than its factorization.

1606664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1108 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1606664 is about 1267.5425042183. The cubic root of 1606664 is about 117.1228650622.

The spelling of 1606664 in words is "one million, six hundred six thousand, six hundred sixty-four".