640052 has 12 divisors (see below), whose sum is σ = 1280160. Its totient is φ = 274296.

The previous prime is 640049. The next prime is 640061. The reversal of 640052 is 250046.

640052 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 640052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11402 + ... + 11457.

It is an arithmetic number, because the mean of its divisors is an integer number (106680).

2⁶⁴⁰⁰⁵² is an apocalyptic number.

It is an amenable number.

640052 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640052 is a wasteful number, since it uses less digits than its factorization.

640052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22870 (or 22868 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 640052 is about 800.0324993399. The cubic root of 640052 is about 86.1797215090.

Adding to 640052 its reverse (250046), we get a palindrome (890098).

The spelling of 640052 in words is "six hundred forty thousand, fifty-two".