644083 has 6 divisors (see below), whose sum is σ = 708092. Its totient is φ = 585420.

The previous prime is 644057. The next prime is 644089. The reversal of 644083 is 380446.

It is not a de Polignac number, because 644083 - 2⁵ = 644051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2541 + ... + 2782.

2⁶⁴⁴⁰⁸³ is an apocalyptic number.

644083 is a deficient number, since it is larger than the sum of its proper divisors (64009).

644083 is a wasteful number, since it uses less digits than its factorization.

644083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5345 (or 5334 counting only the distinct ones).

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

The square root of 644083 is about 802.5478178900. The cubic root of 644083 is about 86.3602608603.

The spelling of 644083 in words is "six hundred forty-four thousand, eighty-three".