643630413 has 16 divisors (see below), whose sum is σ = 896163840. Its totient is φ = 410120304.

The previous prime is 643630397. The next prime is 643630433. The reversal of 643630413 is 314036346.

It is not a de Polignac number, because 643630413 - 2⁴ = 643630397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643630433) 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, 118720 + ... + 124022.

It is an arithmetic number, because the mean of its divisors is an integer number (56010240).

Almost surely, 2^643630413 is an apocalyptic number.

It is an amenable number.

643630413 is a deficient number, since it is larger than the sum of its proper divisors (252533427).

643630413 is a wasteful number, since it uses less digits than its factorization.

643630413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 643630413 is about 25369.8721518261. The cubic root of 643630413 is about 863.4002812117.

Adding to 643630413 its reverse (314036346), we get a palindrome (957666759).

The spelling of 643630413 in words is "six hundred forty-three million, six hundred thirty thousand, four hundred thirteen".