257454728 has 8 divisors (see below), whose sum is σ = 482727630. Its totient is φ = 128727360.

The previous prime is 257454727. The next prime is 257454739. The reversal of 257454728 is 827454752.

It can be written as a sum of positive squares in only one way, i.e., 194379364 + 63075364 = 13942^2 + 7942^2 .

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

It is not an unprimeable number, because it can be changed into a prime (257454727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16090913 + ... + 16090928.

Almost surely, 2^257454728 is an apocalyptic number.

It is an amenable number.

257454728 is a deficient number, since it is larger than the sum of its proper divisors (225272902).

257454728 is a wasteful number, since it uses less digits than its factorization.

257454728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32181847 (or 32181843 counting only the distinct ones).

The product of its digits is 627200, while the sum is 44.

The square root of 257454728 is about 16045.3958505236. The cubic root of 257454728 is about 636.1608772513.

The spelling of 257454728 in words is "two hundred fifty-seven million, four hundred fifty-four thousand, seven hundred twenty-eight".