643722772 has 24 divisors (see below), whose sum is σ = 1404486720. Its totient is φ = 250800960.

The previous prime is 643722721. The next prime is 643722791. The reversal of 643722772 is 277227346.

643722772 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, 1044697 + ... + 1045312.

It is an arithmetic number, because the mean of its divisors is an integer number (58520280).

Almost surely, 2^643722772 is an apocalyptic number.

It is an amenable number.

643722772 is an abundant number, since it is smaller than the sum of its proper divisors (760763948).

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

643722772 is a wasteful number, since it uses less digits than its factorization.

643722772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090031 (or 2090029 counting only the distinct ones).

The product of its digits is 197568, while the sum is 40.

The square root of 643722772 is about 25371.6923361450. The cubic root of 643722772 is about 863.4415776716.

The spelling of 643722772 in words is "six hundred forty-three million, seven hundred twenty-two thousand, seven hundred seventy-two".