257945856 has 72 divisors (see below), whose sum is σ = 784601664. Its totient is φ = 73697280.

The previous prime is 257945827. The next prime is 257945861. The reversal of 257945856 is 658549752.

It is a junction number, because it is equal to n+sod(n) for n = 257945799 and 257945808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18615 + ... + 29366.

Almost surely, 2^257945856 is an apocalyptic number.

It is an amenable number.

257945856 is an abundant number, since it is smaller than the sum of its proper divisors (526655808).

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

257945856 is an equidigital number, since it uses as much as digits as its factorization.

257945856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48007 (or 47993 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 51.

The square root of 257945856 is about 16060.6928866721. The cubic root of 257945856 is about 636.5651398585.

The spelling of 257945856 in words is "two hundred fifty-seven million, nine hundred forty-five thousand, eight hundred fifty-six".