643727346 has 16 divisors (see below), whose sum is σ = 1288372800. Its totient is φ = 214422768.

The previous prime is 643727323. The next prime is 643727387.

643727346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643727298 and 643727307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28966 + ... + 46113.

It is an arithmetic number, because the mean of its divisors is an integer number (80523300).

Almost surely, 2^643727346 is an apocalyptic number.

643727346 is an abundant number, since it is smaller than the sum of its proper divisors (644645454).

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

643727346 is a wasteful number, since it uses less digits than its factorization.

643727346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76513.

The product of its digits is 508032, while the sum is 42.

The square root of 643727346 is about 25371.7824758136. The cubic root of 643727346 is about 863.4436227405.

The spelling of 643727346 in words is "six hundred forty-three million, seven hundred twenty-seven thousand, three hundred forty-six".