643304013 has 16 divisors (see below), whose sum is σ = 967982400. Its totient is φ = 376436480.

The previous prime is 643303967. The next prime is 643304069. The reversal of 643304013 is 310403346.

It is a cyclic number.

It is not a de Polignac number, because 643304013 - 2¹⁴ = 643287629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643304083) 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, 335148 + ... + 337061.

It is an arithmetic number, because the mean of its divisors is an integer number (60498900).

Almost surely, 2^643304013 is an apocalyptic number.

It is an amenable number.

643304013 is a deficient number, since it is larger than the sum of its proper divisors (324678387).

643304013 is a wasteful number, since it uses less digits than its factorization.

643304013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672252.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 643304013 is about 25363.4385090035. The cubic root of 643304013 is about 863.2543063905.

Adding to 643304013 its reverse (310403346), we get a palindrome (953707359).

The spelling of 643304013 in words is "six hundred forty-three million, three hundred four thousand, thirteen".