257947728 has 40 divisors (see below), whose sum is σ = 682622976. Its totient is φ = 83884800.

The previous prime is 257947673. The next prime is 257947733. The reversal of 257947728 is 827749752.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63568 + ... + 67503.

Almost surely, 2^257947728 is an apocalyptic number.

It is an amenable number.

257947728 is an abundant number, since it is smaller than the sum of its proper divisors (424675248).

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

257947728 is a wasteful number, since it uses less digits than its factorization.

257947728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131123 (or 131117 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 51.

The square root of 257947728 is about 16060.7511654966. The cubic root of 257947728 is about 636.5666797774.

The spelling of 257947728 in words is "two hundred fifty-seven million, nine hundred forty-seven thousand, seven hundred twenty-eight".