644334 has 16 divisors (see below), whose sum is σ = 1364688. Its totient is φ = 202112.

The previous prime is 644327. The next prime is 644341. The reversal of 644334 is 433446.

It is an interprime number because it is at equal distance from previous prime (644327) and next prime (644341).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 644334.

It is an unprimeable number.

644334 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3057 + ... + 3260.

It is an arithmetic number, because the mean of its divisors is an integer number (85293).

2⁶⁴⁴³³⁴ is an apocalyptic number.

644334 is an abundant number, since it is smaller than the sum of its proper divisors (720354).

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

644334 is a wasteful number, since it uses less digits than its factorization.

644334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339.

The product of its digits is 3456, while the sum is 24.

The square root of 644334 is about 802.7041796328. The cubic root of 644334 is about 86.3714776394.

The spelling of 644334 in words is "six hundred forty-four thousand, three hundred thirty-four".