1664056 has 16 divisors (see below), whose sum is σ = 3160800. Its totient is φ = 821184.

The previous prime is 1664053. The next prime is 1664063. The reversal of 1664056 is 6504661.

It is a super-2 number, since 2×1664056² = 5538164742272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (197550).

2^1664056 is an apocalyptic number.

It is an amenable number.

1664056 is a deficient number, since it is larger than the sum of its proper divisors (1496744).

1664056 is a wasteful number, since it uses less digits than its factorization.

1664056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1664056 is about 1289.9829456237. The cubic root of 1664056 is about 118.5011720465.

The spelling of 1664056 in words is "one million, six hundred sixty-four thousand, fifty-six".