643950460 has 24 divisors (see below), whose sum is σ = 1352791440. Its totient is φ = 257485824.

The previous prime is 643950457. The next prime is 643950473. The reversal of 643950460 is 64059346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82027 + ... + 89533.

It is an arithmetic number, because the mean of its divisors is an integer number (56366310).

Almost surely, 2^643950460 is an apocalyptic number.

It is an amenable number.

643950460 is an abundant number, since it is smaller than the sum of its proper divisors (708840980).

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

643950460 is a wasteful number, since it uses less digits than its factorization.

643950460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11805 (or 11803 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 643950460 is about 25376.1789873889. The cubic root of 643950460 is about 863.5433668890.

The spelling of 643950460 in words is "six hundred forty-three million, nine hundred fifty thousand, four hundred sixty".