640588 has 24 divisors (see below), whose sum is σ = 1229312. Its totient is φ = 290304.

The previous prime is 640583. The next prime is 640589. The reversal of 640588 is 885046.

It is not an unprimeable number, because it can be changed into a prime (640583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4981 + ... + 5107.

2⁶⁴⁰⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

640588 is a deficient number, since it is larger than the sum of its proper divisors (588724).

640588 is a wasteful number, since it uses less digits than its factorization.

640588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 640588 is about 800.3674156286. The cubic root of 640588 is about 86.2037713479.

The spelling of 640588 in words is "six hundred forty thousand, five hundred eighty-eight".