643404346 has 32 divisors (see below), whose sum is σ = 1086680448. Its totient is φ = 283483200.

The previous prime is 643404337. The next prime is 643404347.

643404346 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (643404347) 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, 493896 + ... + 495196.

It is an arithmetic number, because the mean of its divisors is an integer number (33958764).

Almost surely, 2^643404346 is an apocalyptic number.

643404346 is a deficient number, since it is larger than the sum of its proper divisors (443276102).

643404346 is a wasteful number, since it uses less digits than its factorization.

643404346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166.

The product of its (nonzero) digits is 82944, while the sum is 34.

The square root of 643404346 is about 25365.4163379985. The cubic root of 643404346 is about 863.2991832502.

It can be divided in two parts, 64340 and 4346, that added together give a palindrome (68686).

The spelling of 643404346 in words is "six hundred forty-three million, four hundred four thousand, three hundred forty-six".