646044 has 24 divisors (see below), whose sum is σ = 1723008. Its totient is φ = 184560.

The previous prime is 646039. The next prime is 646067. The reversal of 646044 is 440646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3762 + ... + 3929.

It is an arithmetic number, because the mean of its divisors is an integer number (71792).

2⁶⁴⁶⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

646044 is an abundant number, since it is smaller than the sum of its proper divisors (1076964).

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

646044 is a wasteful number, since it uses less digits than its factorization.

646044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7705 (or 7703 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 646044 is about 803.7686234234. The cubic root of 646044 is about 86.4478173239.

The spelling of 646044 in words is "six hundred forty-six thousand, forty-four".