643332 has 12 divisors (see below), whose sum is σ = 1501136. Its totient is φ = 214440.

The previous prime is 643303. The next prime is 643369. The reversal of 643332 is 233346.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) 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 a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643299 and 643308.

It is an unprimeable number.

643332 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26794 + ... + 26817.

2⁶⁴³³³² is an apocalyptic number.

It is an amenable number.

643332 is an abundant number, since it is smaller than the sum of its proper divisors (857804).

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

643332 is a wasteful number, since it uses less digits than its factorization.

643332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53618 (or 53616 counting only the distinct ones).

The product of its digits is 1296, while the sum is 21.

The square root of 643332 is about 802.0797965290. The cubic root of 643332 is about 86.3266824862.

Adding to 643332 its reverse (233346), we get a palindrome (876678).

The spelling of 643332 in words is "six hundred forty-three thousand, three hundred thirty-two".