257233728 has 28 divisors (see below), whose sum is σ = 680598080. Its totient is φ = 85744512.

The previous prime is 257233727. The next prime is 257233777. The reversal of 257233728 is 827332752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257233721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669688 + ... + 670071.

Almost surely, 2^257233728 is an apocalyptic number.

It is an amenable number.

257233728 is an abundant number, since it is smaller than the sum of its proper divisors (423364352).

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

257233728 is a wasteful number, since it uses less digits than its factorization.

257233728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339774 (or 1339764 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 257233728 is about 16038.5076612508. The cubic root of 257233728 is about 635.9787976002.

The spelling of 257233728 in words is "two hundred fifty-seven million, two hundred thirty-three thousand, seven hundred twenty-eight".