643405254 has 32 divisors (see below), whose sum is σ = 1296829440. Its totient is φ = 212805600.

The previous prime is 643405211. The next prime is 643405267. The reversal of 643405254 is 452504346.

643405254 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 15 ways as a sum of consecutive naturals, for example, 605884 + ... + 606944.

It is an arithmetic number, because the mean of its divisors is an integer number (40525920).

Almost surely, 2^643405254 is an apocalyptic number.

643405254 is an abundant number, since it is smaller than the sum of its proper divisors (653424186).

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

643405254 is a wasteful number, since it uses less digits than its factorization.

643405254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 643405254 is about 25365.4342363777. The cubic root of 643405254 is about 863.2995893584.

The spelling of 643405254 in words is "six hundred forty-three million, four hundred five thousand, two hundred fifty-four".