660256 has 24 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 322368.

The previous prime is 660251. The next prime is 660271. The reversal of 660256 is 652066.

It is a self number, because there is not a number n which added to its sum of digits gives 660256.

It is not an unprimeable number, because it can be changed into a prime (660251) by changing a digit.

660256 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, 1285 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2⁶⁶⁰²⁵⁶ 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 660256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

660256 is an abundant number, since it is smaller than the sum of its proper divisors (670304).

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

660256 is a wasteful number, since it uses less digits than its factorization.

660256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 660256 is about 812.5613822967. The cubic root of 660256 is about 87.0771324589.

The spelling of 660256 in words is "six hundred sixty thousand, two hundred fifty-six".