257690256 has 20 divisors (see below), whose sum is σ = 665699952. Its totient is φ = 85896736.

The previous prime is 257690249. The next prime is 257690263. The reversal of 257690256 is 652096752.

It is an interprime number because it is at equal distance from previous prime (257690249) and next prime (257690263).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684226 + ... + 2684321.

Almost surely, 2^257690256 is an apocalyptic number.

It is an amenable number.

257690256 is an abundant number, since it is smaller than the sum of its proper divisors (408009696).

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

257690256 is a wasteful number, since it uses less digits than its factorization.

257690256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368558 (or 5368552 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 257690256 is about 16052.7335989856. The cubic root of 257690256 is about 636.3548117119.

The spelling of 257690256 in words is "two hundred fifty-seven million, six hundred ninety thousand, two hundred fifty-six".