256520368 has 60 divisors (see below), whose sum is σ = 566619240. Its totient is φ = 112140288.

The previous prime is 256520333. The next prime is 256520417. The reversal of 256520368 is 863025652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48880 + ... + 53872.

It is an arithmetic number, because the mean of its divisors is an integer number (9443654).

Almost surely, 2^256520368 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 256520368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283309620).

256520368 is an abundant number, since it is smaller than the sum of its proper divisors (310098872).

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

256520368 is a wasteful number, since it uses less digits than its factorization.

256520368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046 (or 5027 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 256520368 is about 16016.2532447511. The cubic root of 256520368 is about 635.3903549816.

The spelling of 256520368 in words is "two hundred fifty-six million, five hundred twenty thousand, three hundred sixty-eight".