643407260 has 96 divisors (see below), whose sum is σ = 1483030080. Its totient is φ = 233625600.

The previous prime is 643407251. The next prime is 643407277. The reversal of 643407260 is 62704346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 950042 + ... + 950718.

It is an arithmetic number, because the mean of its divisors is an integer number (15448230).

Almost surely, 2^643407260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643407260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741515040).

643407260 is an abundant number, since it is smaller than the sum of its proper divisors (839622820).

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

643407260 is a wasteful number, since it uses less digits than its factorization.

643407260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 643407260 is about 25365.4737783468. The cubic root of 643407260 is about 863.3004865520.

The spelling of 643407260 in words is "six hundred forty-three million, four hundred seven thousand, two hundred sixty".