643012068 has 24 divisors (see below), whose sum is σ = 1521495360. Its totient is φ = 211318240.

The previous prime is 643012057. The next prime is 643012091. The reversal of 643012068 is 860210346.

643012068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 376503 + ... + 378206.

It is an arithmetic number, because the mean of its divisors is an integer number (63395640).

Almost surely, 2^643012068 is an apocalyptic number.

It is an amenable number.

643012068 is an abundant number, since it is smaller than the sum of its proper divisors (878483292).

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

643012068 is a wasteful number, since it uses less digits than its factorization.

643012068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754787 (or 754785 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 643012068 is about 25357.6826228266. The cubic root of 643012068 is about 863.1236989289.

The spelling of 643012068 in words is "six hundred forty-three million, twelve thousand, sixty-eight".