643324 has 12 divisors (see below), whose sum is σ = 1228248. Its totient is φ = 292400.

The previous prime is 643303. The next prime is 643369. The reversal of 643324 is 423346.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a d-powerful number, because it can be written as 6⁶ + 4⁴ + 3³ + 3⁸ + 2¹⁹ + 4⁸ .

It is a junction number, because it is equal to n+sod(n) for n = 643295 and 643304.

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, 7267 + ... + 7354.

It is an arithmetic number, because the mean of its divisors is an integer number (102354).

2⁶⁴³³²⁴ is an apocalyptic number.

It is an amenable number.

643324 is a deficient number, since it is larger than the sum of its proper divisors (584924).

643324 is a wasteful number, since it uses less digits than its factorization.

643324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14636 (or 14634 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 643324 is about 802.0748094785. The cubic root of 643324 is about 86.3263246531.

Adding to 643324 its sum of digits (22), we get a palindrome (643346).

The spelling of 643324 in words is "six hundred forty-three thousand, three hundred twenty-four".