1644064 has 24 divisors (see below), whose sum is σ = 3281040. Its totient is φ = 810816.

The previous prime is 1644061. The next prime is 1644067. The reversal of 1644064 is 4604461.

It is an interprime number because it is at equal distance from previous prime (1644061) and next prime (1644067).

It is a super-3 number, since 3×1644064³ = 13331450788541202432, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347 + ... + 2965.

It is an arithmetic number, because the mean of its divisors is an integer number (136710).

2^1644064 is an apocalyptic number.

It is an amenable number.

1644064 is a deficient number, since it is larger than the sum of its proper divisors (1636976).

1644064 is an equidigital number, since it uses as much as digits as its factorization.

1644064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1644064 is about 1282.2105911277. The cubic root of 1644064 is about 118.0247003736.

The spelling of 1644064 in words is "one million, six hundred forty-four thousand, sixty-four".