257798868 has 12 divisors (see below), whose sum is σ = 601530720. Its totient is φ = 85932952.

The previous prime is 257798851. The next prime is 257798873. The reversal of 257798868 is 868897752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10741608 + ... + 10741631.

It is an arithmetic number, because the mean of its divisors is an integer number (50127560).

Almost surely, 2^257798868 is an apocalyptic number.

It is an amenable number.

257798868 is an abundant number, since it is smaller than the sum of its proper divisors (343731852).

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

257798868 is a wasteful number, since it uses less digits than its factorization.

257798868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21483246 (or 21483244 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 60.

The square root of 257798868 is about 16056.1162178156. The cubic root of 257798868 is about 636.4442033479. Note that the first 3 decimals are identical.

The spelling of 257798868 in words is "two hundred fifty-seven million, seven hundred ninety-eight thousand, eight hundred sixty-eight".