643832 has 16 divisors (see below), whose sum is σ = 1379760. Its totient is φ = 275904.

The previous prime is 643781. The next prime is 643847. The reversal of 643832 is 238346.

643832 is nontrivially palindromic in base 6.

It is a congruent number.

It is an unprimeable number.

643832 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5693 + ... + 5804.

It is an arithmetic number, because the mean of its divisors is an integer number (86235).

2⁶⁴³⁸³² is an apocalyptic number.

It is an amenable number.

643832 is an abundant number, since it is smaller than the sum of its proper divisors (735928).

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

643832 is a wasteful number, since it uses less digits than its factorization.

643832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510 (or 11506 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 643832 is about 802.3914256770. The cubic root of 643832 is about 86.3490411666.

The spelling of 643832 in words is "six hundred forty-three thousand, eight hundred thirty-two".