256375856 has 40 divisors (see below), whose sum is σ = 548774400. Its totient is φ = 115053120.

The previous prime is 256375853. The next prime is 256375877. The reversal of 256375856 is 658573652.

It is a self number, because there is not a number n which added to its sum of digits gives 256375856.

It is not an unprimeable number, because it can be changed into a prime (256375853) 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, 4685 + ... + 23123.

It is an arithmetic number, because the mean of its divisors is an integer number (13719360).

Almost surely, 2^256375856 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 256375856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274387200).

256375856 is an abundant number, since it is smaller than the sum of its proper divisors (292398544).

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

256375856 is a wasteful number, since it uses less digits than its factorization.

256375856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18537 (or 18531 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 47.

The square root of 256375856 is about 16011.7411920128. The cubic root of 256375856 is about 635.2710158172.

The spelling of 256375856 in words is "two hundred fifty-six million, three hundred seventy-five thousand, eight hundred fifty-six".