643058660 has 48 divisors (see below), whose sum is σ = 1432214784. Its totient is φ = 241694208.

The previous prime is 643058651. The next prime is 643058671. The reversal of 643058660 is 66850346.

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, 280037 + ... + 282323.

It is an arithmetic number, because the mean of its divisors is an integer number (29837808).

Almost surely, 2^643058660 is an apocalyptic number.

It is an amenable number.

643058660 is an abundant number, since it is smaller than the sum of its proper divisors (789156124).

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

643058660 is a wasteful number, since it uses less digits than its factorization.

643058660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140 (or 3138 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 643058660 is about 25358.6013021223. The cubic root of 643058660 is about 863.1445454470.

The spelling of 643058660 in words is "six hundred forty-three million, fifty-eight thousand, six hundred sixty".