643022 has 8 divisors (see below), whose sum is σ = 987096. Its totient is φ = 313992.

The previous prime is 643021. The next prime is 643031. The reversal of 643022 is 220346.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653 + ... + 3824.

It is an arithmetic number, because the mean of its divisors is an integer number (123387).

2⁶⁴³⁰²² is an apocalyptic number.

643022 is a deficient number, since it is larger than the sum of its proper divisors (344074).

643022 is a wasteful number, since it uses less digits than its factorization.

643022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7522.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 643022 is about 801.8865256381. The cubic root of 643022 is about 86.3128142858.

Adding to 643022 its reverse (220346), we get a palindrome (863368).

The spelling of 643022 in words is "six hundred forty-three thousand, twenty-two".