643222346 has 16 divisors (see below), whose sum is σ = 1039918824. Its totient is φ = 296624064.

The previous prime is 643222343. The next prime is 643222357.

643222346 is nontrivially palindromic in base 10.

643222346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 427455625 + 215766721 = 20675^2 + 14689^2 .

It is not an unprimeable number, because it can be changed into a prime (643222343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23516 + ... + 42888.

Almost surely, 2^643222346 is an apocalyptic number.

643222346 is a deficient number, since it is larger than the sum of its proper divisors (396696478).

643222346 is a wasteful number, since it uses less digits than its factorization.

643222346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20665.

The product of its digits is 41472, while the sum is 32.

The square root of 643222346 is about 25361.8285224074. The cubic root of 643222346 is about 863.2177749986.

The spelling of 643222346 in words is "six hundred forty-three million, two hundred twenty-two thousand, three hundred forty-six".