656864256 has 88 divisors (see below), whose sum is σ = 1798412320. Its totient is φ = 213000192.

The previous prime is 656864251. The next prime is 656864281. The reversal of 656864256 is 652468656.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656864251) 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, 110775 + ... + 116553.

Almost surely, 2^656864256 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 656864256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899206160).

656864256 is an abundant number, since it is smaller than the sum of its proper divisors (1141548064).

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

656864256 is a wasteful number, since it uses less digits than its factorization.

656864256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839 (or 5821 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 48.

The square root of 656864256 is about 25629.3631602504. The cubic root of 656864256 is about 869.2777093980.

The spelling of 656864256 in words is "six hundred fifty-six million, eight hundred sixty-four thousand, two hundred fifty-six".