643456792 has 32 divisors (see below), whose sum is σ = 1337749200. Its totient is φ = 287683200.

The previous prime is 643456769. The next prime is 643456819. The reversal of 643456792 is 297654346.

643456792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54567 + ... + 65302.

Almost surely, 2^643456792 is an apocalyptic number.

It is an amenable number.

643456792 is an abundant number, since it is smaller than the sum of its proper divisors (694292408).

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

643456792 is a wasteful number, since it uses less digits than its factorization.

643456792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119947 (or 119943 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 643456792 is about 25366.4501261016. The cubic root of 643456792 is about 863.3226393962.

The spelling of 643456792 in words is "six hundred forty-three million, four hundred fifty-six thousand, seven hundred ninety-two".