643355632 has 40 divisors (see below), whose sum is σ = 1302907680. Its totient is φ = 307169280.

The previous prime is 643355623. The next prime is 643355651. The reversal of 643355632 is 236553346.

643355632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×643355632² = 827812938452238848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643355591 and 643355600.

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, 296632 + ... + 298792.

It is an arithmetic number, because the mean of its divisors is an integer number (32572692).

Almost surely, 2^643355632 is an apocalyptic number.

It is an amenable number.

643355632 is an abundant number, since it is smaller than the sum of its proper divisors (659552048).

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

643355632 is a wasteful number, since it uses less digits than its factorization.

643355632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001 (or 2995 counting only the distinct ones).

The product of its digits is 194400, while the sum is 37.

The square root of 643355632 is about 25364.4560753823. The cubic root of 643355632 is about 863.2773950761.

The spelling of 643355632 in words is "six hundred forty-three million, three hundred fifty-five thousand, six hundred thirty-two".