643588680 has 64 divisors (see below), whose sum is σ = 2206592640. Its totient is φ = 147105792.

The previous prime is 643588679. The next prime is 643588681. The reversal of 643588680 is 86885346.

It is an interprime number because it is at equal distance from previous prime (643588679) and next prime (643588681).

It is not an unprimeable number, because it can be changed into a prime (643588681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382249 + ... + 383928.

It is an arithmetic number, because the mean of its divisors is an integer number (34478010).

Almost surely, 2^643588680 is an apocalyptic number.

643588680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643588680 is an abundant number, since it is smaller than the sum of its proper divisors (1563003960).

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

643588680 is a wasteful number, since it uses less digits than its factorization.

643588680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766198 (or 766194 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The square root of 643588680 is about 25369.0496471586. The cubic root of 643588680 is about 863.3816198485.

The spelling of 643588680 in words is "six hundred forty-three million, five hundred eighty-eight thousand, six hundred eighty".