644302 has 8 divisors (see below), whose sum is σ = 970776. Its totient is φ = 320712.

The previous prime is 644297. The next prime is 644327. The reversal of 644302 is 203446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 644302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (121347).

2⁶⁴⁴³⁰² is an apocalyptic number.

644302 is a deficient number, since it is larger than the sum of its proper divisors (326474).

644302 is a wasteful number, since it uses less digits than its factorization.

644302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 644302 is about 802.6842467621. The cubic root of 644302 is about 86.3700477738.

Adding to 644302 its reverse (203446), we get a palindrome (847748).

It can be divided in two parts, 644 and 302, that added together give a triangular number (946 = T₄₃).

The spelling of 644302 in words is "six hundred forty-four thousand, three hundred two".