643303222 has 16 divisors (see below), whose sum is σ = 1022561712. Its totient is φ = 302480640.

The previous prime is 643303217. The next prime is 643303223. The reversal of 643303222 is 222303346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643303223) 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 7 ways as a sum of consecutive naturals, for example, 37753 + ... + 52075.

It is an arithmetic number, because the mean of its divisors is an integer number (63910107).

Almost surely, 2^643303222 is an apocalyptic number.

643303222 is a deficient number, since it is larger than the sum of its proper divisors (379258490).

643303222 is a wasteful number, since it uses less digits than its factorization.

643303222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15663.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 643303222 is about 25363.4229156871. The cubic root of 643303222 is about 863.2539525741.

Adding to 643303222 its reverse (222303346), we get a palindrome (865606568).

The spelling of 643303222 in words is "six hundred forty-three million, three hundred three thousand, two hundred twenty-two".