257828728 has 32 divisors (see below), whose sum is σ = 502124400. Its totient is φ = 124008192.

The previous prime is 257828723. The next prime is 257828741. The reversal of 257828728 is 827828752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257828723) by changing a digit.

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, 21451 + ... + 31237.

Almost surely, 2^257828728 is an apocalyptic number.

It is an amenable number.

257828728 is a deficient number, since it is larger than the sum of its proper divisors (244295672).

257828728 is a wasteful number, since it uses less digits than its factorization.

257828728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9919 (or 9915 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 49.

The square root of 257828728 is about 16057.0460546142. The cubic root of 257828728 is about 636.4687748163.

The spelling of 257828728 in words is "two hundred fifty-seven million, eight hundred twenty-eight thousand, seven hundred twenty-eight".