257533928 has 8 divisors (see below), whose sum is σ = 482876130. Its totient is φ = 128766960.

The previous prime is 257533907. The next prime is 257533931. The reversal of 257533928 is 829335752.

It can be written as a sum of positive squares in only one way, i.e., 237838084 + 19695844 = 15422^2 + 4438^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×257533928² = 132647448142218368, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 16095863 + ... + 16095878.

Almost surely, 2^257533928 is an apocalyptic number.

It is an amenable number.

257533928 is a deficient number, since it is larger than the sum of its proper divisors (225342202).

257533928 is a wasteful number, since it uses less digits than its factorization.

257533928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32191747 (or 32191743 counting only the distinct ones).

The product of its digits is 453600, while the sum is 44.

The square root of 257533928 is about 16047.8636584438. The cubic root of 257533928 is about 636.2261039629.

The spelling of 257533928 in words is "two hundred fifty-seven million, five hundred thirty-three thousand, nine hundred twenty-eight".