257728587616 has 24 divisors (see below), whose sum is σ = 507417281280. Its totient is φ = 128860706688.

The previous prime is 257728587563. The next prime is 257728587631. The reversal of 257728587616 is 616785827752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1348030 + ... + 1527298.

It is an arithmetic number, because the mean of its divisors is an integer number (21142386720).

Almost surely, 2^257728587616 is an apocalyptic number.

It is an amenable number.

257728587616 is a deficient number, since it is larger than the sum of its proper divisors (249688693664).

257728587616 is a wasteful number, since it uses less digits than its factorization.

257728587616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224206 (or 224198 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 64.

The spelling of 257728587616 in words is "two hundred fifty-seven billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, six hundred sixteen".