128257005 has 16 divisors (see below), whose sum is σ = 205571520. Its totient is φ = 68283648.

The previous prime is 128257001. The next prime is 128257007. The reversal of 128257005 is 500752821.

It is not a de Polignac number, because 128257005 - 2² = 128257001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686 + ... + 16104.

It is an arithmetic number, because the mean of its divisors is an integer number (12848220).

Almost surely, 2^128257005 is an apocalyptic number.

128257005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128257005 is a deficient number, since it is larger than the sum of its proper divisors (77314515).

128257005 is a wasteful number, since it uses less digits than its factorization.

128257005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15020.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 128257005 is about 11325.0609269884. The cubic root of 128257005 is about 504.3054923879.

The spelling of 128257005 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, five".