643426364 has 24 divisors (see below), whose sum is σ = 1331228640. Its totient is φ = 266245056.

The previous prime is 643426339. The next prime is 643426409. The reversal of 643426364 is 463624346.

643426364 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, 395387 + ... + 397010.

It is an arithmetic number, because the mean of its divisors is an integer number (55467860).

Almost surely, 2^643426364 is an apocalyptic number.

It is an amenable number.

643426364 is an abundant number, since it is smaller than the sum of its proper divisors (687802276).

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

643426364 is a wasteful number, since it uses less digits than its factorization.

643426364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792437 (or 792435 counting only the distinct ones).

The product of its digits is 248832, while the sum is 38.

The square root of 643426364 is about 25365.8503504219. The cubic root of 643426364 is about 863.3090308184.

The spelling of 643426364 in words is "six hundred forty-three million, four hundred twenty-six thousand, three hundred sixty-four".