643773368 has 24 divisors (see below), whose sum is σ = 1404149400. Its totient is φ = 275902704.

The previous prime is 643773343. The next prime is 643773433. The reversal of 643773368 is 863377346.

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 5 ways as a sum of consecutive naturals, for example, 820748 + ... + 821531.

It is an arithmetic number, because the mean of its divisors is an integer number (58506225).

Almost surely, 2^643773368 is an apocalyptic number.

It is an amenable number.

643773368 is an abundant number, since it is smaller than the sum of its proper divisors (760376032).

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

643773368 is a wasteful number, since it uses less digits than its factorization.

643773368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642299 (or 1642288 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 47.

The square root of 643773368 is about 25372.6894120430. The cubic root of 643773368 is about 863.4641989756.

The spelling of 643773368 in words is "six hundred forty-three million, seven hundred seventy-three thousand, three hundred sixty-eight".