257428 has 12 divisors (see below), whose sum is σ = 454720. Its totient is φ = 127512.

The previous prime is 257407. The next prime is 257437. The reversal of 257428 is 824752.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 257396 and 257405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 787.

2²⁵⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

257428 is a deficient number, since it is larger than the sum of its proper divisors (197292).

257428 is a wasteful number, since it uses less digits than its factorization.

257428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606 (or 604 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 257428 is about 507.3736295867. The cubic root of 257428 is about 63.6138861864.

The spelling of 257428 in words is "two hundred fifty-seven thousand, four hundred twenty-eight".