257028436 has 24 divisors (see below), whose sum is σ = 519152256. Its totient is φ = 109063200.

The previous prime is 257028433. The next prime is 257028437. The reversal of 257028436 is 634820752.

It is a junction number, because it is equal to n+sod(n) for n = 257028395 and 257028404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257028433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42616 + ... + 48271.

It is an arithmetic number, because the mean of its divisors is an integer number (21631344).

Almost surely, 2^257028436 is an apocalyptic number.

It is an amenable number.

257028436 is an abundant number, since it is smaller than the sum of its proper divisors (262123820).

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

257028436 is a wasteful number, since it uses less digits than its factorization.

257028436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90999 (or 90997 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 257028436 is about 16032.1064118225. The cubic root of 257028436 is about 635.8095661541.

The spelling of 257028436 in words is "two hundred fifty-seven million, twenty-eight thousand, four hundred thirty-six".