257681128 has 8 divisors (see below), whose sum is σ = 483152130. Its totient is φ = 128840560.

The previous prime is 257681113. The next prime is 257681131. The reversal of 257681128 is 821186752.

It can be written as a sum of positive squares in only one way, i.e., 182304004 + 75377124 = 13502^2 + 8682^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16105063 + ... + 16105078.

Almost surely, 2^257681128 is an apocalyptic number.

It is an amenable number.

257681128 is a deficient number, since it is larger than the sum of its proper divisors (225471002).

257681128 is a wasteful number, since it uses less digits than its factorization.

257681128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32210147 (or 32210143 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 257681128 is about 16052.4492835206. The cubic root of 257681128 is about 636.3472978910.

It can be divided in two parts, 25768 and 1128, that added together give a square (26896 = 164²).

The spelling of 257681128 in words is "two hundred fifty-seven million, six hundred eighty-one thousand, one hundred twenty-eight".