257649868 has 24 divisors (see below), whose sum is σ = 516116384. Its totient is φ = 110246400.

The previous prime is 257649839. The next prime is 257649869. The reversal of 257649868 is 868946752.

It is not an unprimeable number, because it can be changed into a prime (257649869) 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 7 ways as a sum of consecutive naturals, for example, 11548 + ... + 25468.

Almost surely, 2^257649868 is an apocalyptic number.

257649868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

257649868 is an abundant number, since it is smaller than the sum of its proper divisors (258466516).

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

257649868 is a wasteful number, since it uses less digits than its factorization.

257649868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14593 (or 14591 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The square root of 257649868 is about 16051.4755708003. The cubic root of 257649868 is about 636.3215645086.

The spelling of 257649868 in words is "two hundred fifty-seven million, six hundred forty-nine thousand, eight hundred sixty-eight".