256566328 has 8 divisors (see below), whose sum is σ = 481061880. Its totient is φ = 128283160.

The previous prime is 256566293. The next prime is 256566341. The reversal of 256566328 is 823665652.

It is a happy number.

256566328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16035388 + ... + 16035403.

It is an arithmetic number, because the mean of its divisors is an integer number (60132735).

Almost surely, 2^256566328 is an apocalyptic number.

It is an amenable number.

256566328 is a deficient number, since it is larger than the sum of its proper divisors (224495552).

256566328 is a wasteful number, since it uses less digits than its factorization.

256566328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32070797 (or 32070793 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The square root of 256566328 is about 16017.6879729879. The cubic root of 256566328 is about 635.4282997226.

The spelling of 256566328 in words is "two hundred fifty-six million, five hundred sixty-six thousand, three hundred twenty-eight".