256385824 has 12 divisors (see below), whose sum is σ = 504759654. Its totient is φ = 128192896.

The previous prime is 256385821. The next prime is 256385837. The reversal of 256385824 is 428583652.

It can be written as a sum of positive squares in only one way, i.e., 205406224 + 50979600 = 14332^2 + 7140^2 .

It is not an unprimeable number, because it can be changed into a prime (256385821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4005997 + ... + 4006060.

Almost surely, 2^256385824 is an apocalyptic number.

It is an amenable number.

256385824 is a deficient number, since it is larger than the sum of its proper divisors (248373830).

256385824 is an equidigital number, since it uses as much as digits as its factorization.

256385824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8012067 (or 8012059 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The square root of 256385824 is about 16012.0524605686. The cubic root of 256385824 is about 635.2792489110.

The spelling of 256385824 in words is "two hundred fifty-six million, three hundred eighty-five thousand, eight hundred twenty-four".