656320 has 56 divisors (see below), whose sum is σ = 1792224. Its totient is φ = 224256.

The previous prime is 656311. The next prime is 656321. The reversal of 656320 is 23656.

It is a tau number, because it is divible by the number of its divisors (56).

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 656291 and 656300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656321) 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, 2094 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (32004).

2⁶⁵⁶³²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896112).

656320 is an abundant number, since it is smaller than the sum of its proper divisors (1135904).

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

656320 is a wasteful number, since it uses less digits than its factorization.

656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 656320 is about 810.1357910869. The cubic root of 656320 is about 86.9037558138.

Adding to 656320 its reverse (23656), we get a palindrome (679976).

The spelling of 656320 in words is "six hundred fifty-six thousand, three hundred twenty".