643328580 has 24 divisors (see below), whose sum is σ = 1801320192. Its totient is φ = 171554272.

The previous prime is 643328479. The next prime is 643328591. The reversal of 643328580 is 85823346.

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, 5361012 + ... + 5361131.

It is an arithmetic number, because the mean of its divisors is an integer number (75055008).

Almost surely, 2^643328580 is an apocalyptic number.

643328580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643328580 is an abundant number, since it is smaller than the sum of its proper divisors (1157991612).

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

643328580 is a wasteful number, since it uses less digits than its factorization.

643328580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722155 (or 10722153 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 643328580 is about 25363.9228038567. The cubic root of 643328580 is about 863.2652951289.

The spelling of 643328580 in words is "six hundred forty-three million, three hundred twenty-eight thousand, five hundred eighty".