257281648 has 40 divisors (see below), whose sum is σ = 554158976. Its totient is φ = 114912000.

The previous prime is 257281637. The next prime is 257281669. The reversal of 257281648 is 846182752.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13503 + ... + 26398.

Almost surely, 2^257281648 is an apocalyptic number.

It is an amenable number.

257281648 is an abundant number, since it is smaller than the sum of its proper divisors (296877328).

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

257281648 is a wasteful number, since it uses less digits than its factorization.

257281648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39953 (or 39947 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 257281648 is about 16040.0014962593. The cubic root of 257281648 is about 636.0182872529.

The spelling of 257281648 in words is "two hundred fifty-seven million, two hundred eighty-one thousand, six hundred forty-eight".