640600 has 24 divisors (see below), whose sum is σ = 1489860. Its totient is φ = 256160.

The previous prime is 640589. The next prime is 640613. The reversal of 640600 is 6046.

It is a congruent number.

It is an unprimeable number.

640600 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1402 + ... + 1801.

2⁶⁴⁰⁶⁰⁰ is an apocalyptic number.

It is an amenable number.

640600 is an abundant number, since it is smaller than the sum of its proper divisors (849260).

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

640600 is a wasteful number, since it uses less digits than its factorization.

640600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219 (or 3210 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 640600 is about 800.3749121505. The cubic root of 640600 is about 86.2043096235.

Adding to 640600 its reverse (6046), we get a palindrome (646646).

The spelling of 640600 in words is "six hundred forty thousand, six hundred".