643263608 has 32 divisors (see below), whose sum is σ = 1300000800. Its totient is φ = 296638848.

The previous prime is 643263589. The next prime is 643263613. The reversal of 643263608 is 806362346.

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, 183698 + ... + 187166.

It is an arithmetic number, because the mean of its divisors is an integer number (40625025).

Almost surely, 2^643263608 is an apocalyptic number.

It is an amenable number.

643263608 is an abundant number, since it is smaller than the sum of its proper divisors (656737192).

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

643263608 is a wasteful number, since it uses less digits than its factorization.

643263608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271 (or 5267 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 643263608 is about 25362.6419759456. The cubic root of 643263608 is about 863.2362327582.

The spelling of 643263608 in words is "six hundred forty-three million, two hundred sixty-three thousand, six hundred eight".