256385448 has 72 divisors (see below), whose sum is σ = 763267050. Its totient is φ = 77689920.

The previous prime is 256385447. The next prime is 256385477. The reversal of 256385448 is 844583652.

256385448 is a `hidden beast` number, since 2 + 5 + 638 + 5 + 4 + 4 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 162256644 + 94128804 = 12738^2 + 9702^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (256385447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6003 + ... + 23426.

Almost surely, 2^256385448 is an apocalyptic number.

It is an amenable number.

256385448 is an abundant number, since it is smaller than the sum of its proper divisors (506881602).

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

256385448 is a wasteful number, since it uses less digits than its factorization.

256385448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29463 (or 29445 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 256385448 is about 16012.0407194086. The cubic root of 256385448 is about 635.2789383568.

The spelling of 256385448 in words is "two hundred fifty-six million, three hundred eighty-five thousand, four hundred forty-eight".