646344 has 48 divisors (see below), whose sum is σ = 1797120. Its totient is φ = 209760.

The previous prime is 646339. The next prime is 646379. The reversal of 646344 is 443646.

It is a happy number.

646344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3289 + ... + 3479.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2⁶⁴⁶³⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898560).

646344 is an abundant number, since it is smaller than the sum of its proper divisors (1150776).

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

646344 is a wasteful number, since it uses less digits than its factorization.

646344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 243 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 646344 is about 803.9552226337. The cubic root of 646344 is about 86.4611963569.

It can be divided in two parts, 646 and 344, that added together give a triangular number (990 = T₄₄).

The spelling of 646344 in words is "six hundred forty-six thousand, three hundred forty-four".