643707346 has 32 divisors (see below), whose sum is σ = 1094472000. Its totient is φ = 282097152.

The previous prime is 643707341. The next prime is 643707367.

643707346 is nontrivially palindromic in base 10.

643707346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643707299 and 643707308.

It is not an unprimeable number, because it can be changed into a prime (643707341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29670 + ... + 46558.

It is an arithmetic number, because the mean of its divisors is an integer number (34202250).

Almost surely, 2^643707346 is an apocalyptic number.

643707346 is a deficient number, since it is larger than the sum of its proper divisors (450764654).

643707346 is a wasteful number, since it uses less digits than its factorization.

643707346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16986.

The product of its (nonzero) digits is 254016, while the sum is 40.

The square root of 643707346 is about 25371.3883341058. The cubic root of 643707346 is about 863.4346805223.

The spelling of 643707346 in words is "six hundred forty-three million, seven hundred seven thousand, three hundred forty-six".