643013544 has 32 divisors (see below), whose sum is σ = 1608217920. Its totient is φ = 214246656.

The previous prime is 643013521. The next prime is 643013597. The reversal of 643013544 is 445310346.

643013544 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, 75469 + ... + 83555.

It is an arithmetic number, because the mean of its divisors is an integer number (50256810).

Almost surely, 2^643013544 is an apocalyptic number.

It is an amenable number.

643013544 is an abundant number, since it is smaller than the sum of its proper divisors (965204376).

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

643013544 is a wasteful number, since it uses less digits than its factorization.

643013544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11409 (or 11405 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 643013544 is about 25357.7117264157. The cubic root of 643013544 is about 863.1243593466.

The spelling of 643013544 in words is "six hundred forty-three million, thirteen thousand, five hundred forty-four".