1664564 has 12 divisors (see below), whose sum is σ = 3177888. Its totient is φ = 756600.

The previous prime is 1664563. The next prime is 1664569. The reversal of 1664564 is 4654661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664561) 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, 18872 + ... + 18959.

It is an arithmetic number, because the mean of its divisors is an integer number (264824).

2^1664564 is an apocalyptic number.

It is an amenable number.

1664564 is a deficient number, since it is larger than the sum of its proper divisors (1513324).

1664564 is a wasteful number, since it uses less digits than its factorization.

1664564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37846 (or 37844 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 1664564 is about 1290.1798324265. The cubic root of 1664564 is about 118.5132294274.

The spelling of 1664564 in words is "one million, six hundred sixty-four thousand, five hundred sixty-four".