1663664 has 10 divisors (see below), whose sum is σ = 3223380. Its totient is φ = 831824.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663664 is 4663661.

It is a self number, because there is not a number n which added to its sum of digits gives 1663664.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51974 + ... + 52005.

It is an arithmetic number, because the mean of its divisors is an integer number (322338).

2^1663664 is an apocalyptic number.

It is an amenable number.

1663664 is a deficient number, since it is larger than the sum of its proper divisors (1559716).

1663664 is a wasteful number, since it uses less digits than its factorization.

1663664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103987 (or 103981 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 1663664 is about 1289.8309966813. The cubic root of 1663664 is about 118.4918662484.

The spelling of 1663664 in words is "one million, six hundred sixty-three thousand, six hundred sixty-four".