643488207 has 16 divisors (see below), whose sum is σ = 877643232. Its totient is φ = 419253120.

The previous prime is 643488193. The next prime is 643488247. The reversal of 643488207 is 702884346.

It is not a de Polignac number, because 643488207 - 2¹⁰ = 643487183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643488247) 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, 17533 + ... + 39929.

It is an arithmetic number, because the mean of its divisors is an integer number (54852702).

Almost surely, 2^643488207 is an apocalyptic number.

643488207 is a deficient number, since it is larger than the sum of its proper divisors (234155025).

643488207 is a wasteful number, since it uses less digits than its factorization.

643488207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22618.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 643488207 is about 25367.0693419638. The cubic root of 643488207 is about 863.3366889484.

The spelling of 643488207 in words is "six hundred forty-three million, four hundred eighty-eight thousand, two hundred seven".