257786868 has 12 divisors (see below), whose sum is σ = 601502720. Its totient is φ = 85928952.

The previous prime is 257786863. The next prime is 257786873. The reversal of 257786868 is 868687752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (257786863) and next prime (257786873).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257786863) by changing a digit.

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, 10741108 + ... + 10741131.

Almost surely, 2^257786868 is an apocalyptic number.

It is an amenable number.

257786868 is an abundant number, since it is smaller than the sum of its proper divisors (343715852).

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

257786868 is a wasteful number, since it uses less digits than its factorization.

257786868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482246 (or 21482244 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 57.

The square root of 257786868 is about 16055.7425240940. The cubic root of 257786868 is about 636.4343281443.

The spelling of 257786868 in words is "two hundred fifty-seven million, seven hundred eighty-six thousand, eight hundred sixty-eight".