128030257 has 4 divisors (see below), whose sum is σ = 128110576. Its totient is φ = 127949940.

The previous prime is 128030251. The next prime is 128030269. The reversal of 128030257 is 752030821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752030821 = 491 ⋅1531631.

It is a cyclic number.

It is not a de Polignac number, because 128030257 - 2⁷ = 128030129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128030251) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 37719 + ... + 40972.

It is an arithmetic number, because the mean of its divisors is an integer number (32027644).

Almost surely, 2^128030257 is an apocalyptic number.

It is an amenable number.

128030257 is a deficient number, since it is larger than the sum of its proper divisors (80319).

128030257 is an equidigital number, since it uses as much as digits as its factorization.

128030257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80318.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 128030257 is about 11315.0456030897. The cubic root of 128030257 is about 504.0081266536.

The spelling of 128030257 in words is "one hundred twenty-eight million, thirty thousand, two hundred fifty-seven".