643616346 has 16 divisors (see below), whose sum is σ = 1317168864. Its totient is φ = 209549424.

The previous prime is 643616297. The next prime is 643616357.

643616346 is nontrivially palindromic in base 10.

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, 1247061 + ... + 1247576.

It is an arithmetic number, because the mean of its divisors is an integer number (82323054).

Almost surely, 2^643616346 is an apocalyptic number.

643616346 is an abundant number, since it is smaller than the sum of its proper divisors (673552518).

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

643616346 is a wasteful number, since it uses less digits than its factorization.

643616346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494685.

The product of its digits is 186624, while the sum is 39.

The square root of 643616346 is about 25369.5949120202. The cubic root of 643616346 is about 863.3939910903.

It can be divided in two parts, 64361 and 6346, that added together give a palindrome (70707).

The spelling of 643616346 in words is "six hundred forty-three million, six hundred sixteen thousand, three hundred forty-six".