640593 has 12 divisors (see below), whose sum is σ = 935220. Its totient is φ = 422496.

The previous prime is 640589. The next prime is 640613. The reversal of 640593 is 395046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 294849 + 345744 = 543^2 + 588^2 .

It is not a de Polignac number, because 640593 - 2² = 640589 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 655 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (77935).

2⁶⁴⁰⁵⁹³ is an apocalyptic number.

It is an amenable number.

640593 is a deficient number, since it is larger than the sum of its proper divisors (294627).

640593 is a wasteful number, since it uses less digits than its factorization.

640593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 640593 is about 800.3705391879. The cubic root of 640593 is about 86.2039956302.

The spelling of 640593 in words is "six hundred forty thousand, five hundred ninety-three".