257440816 has 10 divisors (see below), whose sum is σ = 498791612. Its totient is φ = 128720400.

The previous prime is 257440793. The next prime is 257440829. The reversal of 257440816 is 618044752.

257440816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8045010 + ... + 8045041.

Almost surely, 2^257440816 is an apocalyptic number.

It is an amenable number.

257440816 is a deficient number, since it is larger than the sum of its proper divisors (241350796).

257440816 is a wasteful number, since it uses less digits than its factorization.

257440816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16090059 (or 16090053 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 257440816 is about 16044.9623246675. The cubic root of 257440816 is about 636.1494183700.

The spelling of 257440816 in words is "two hundred fifty-seven million, four hundred forty thousand, eight hundred sixteen".