643606346 has 4 divisors (see below), whose sum is σ = 965409522. Its totient is φ = 321803172.

The previous prime is 643606331. The next prime is 643606357.

643606346 is nontrivially palindromic in base 10.

643606346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 328153225 + 315453121 = 18115^2 + 17761^2 .

It is a super-2 number, since 2×643606346² = 828458257222943432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160901585 + ... + 160901588.

Almost surely, 2^643606346 is an apocalyptic number.

643606346 is a deficient number, since it is larger than the sum of its proper divisors (321803176).

643606346 is a wasteful number, since it uses less digits than its factorization.

643606346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321803175.

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 643606346 is about 25369.3978249386. The cubic root of 643606346 is about 863.3895194903.

The spelling of 643606346 in words is "six hundred forty-three million, six hundred six thousand, three hundred forty-six".