652640 has 24 divisors (see below), whose sum is σ = 1542240. Its totient is φ = 260992.

The previous prime is 652627. The next prime is 652651. The reversal of 652640 is 46256.

Added to its reverse (46256) it gives a square (698896 = 836²).

652640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

652640 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 3 ways as a sum of consecutive naturals, for example, 1880 + ... + 2199.

It is an arithmetic number, because the mean of its divisors is an integer number (64260).

2⁶⁵²⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

652640 is an abundant number, since it is smaller than the sum of its proper divisors (889600).

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

652640 is a wasteful number, since it uses less digits than its factorization.

652640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094 (or 4086 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 652640 is about 807.8613742468. The cubic root of 652640 is about 86.7410275666.

Adding to 652640 its reverse (46256), we get a palindrome (698896).

The spelling of 652640 in words is "six hundred fifty-two thousand, six hundred forty".