1644066 has 24 divisors (see below), whose sum is σ = 3591900. Its totient is φ = 543456.

The previous prime is 1644061. The next prime is 1644067. The reversal of 1644066 is 6604461.

It can be written as a sum of positive squares in 2 ways, for example, as 1147041 + 497025 = 1071^2 + 705^2 .

It is a super-3 number, since 3×1644066³ = 13331499441636238488, 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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2376 + ... + 2988.

2^1644066 is an apocalyptic number.

1644066 is an abundant number, since it is smaller than the sum of its proper divisors (1947834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644066 is a wasteful number, since it uses less digits than its factorization.

1644066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1644066 is about 1282.2113710305. The cubic root of 1644066 is about 118.0247482325.

The spelling of 1644066 in words is "one million, six hundred forty-four thousand, sixty-six".