128257455 has 32 divisors (see below), whose sum is σ = 209018880. Its totient is φ = 67147520.

The previous prime is 128257439. The next prime is 128257457. The reversal of 128257455 is 554752821.

It is not a de Polignac number, because 128257455 - 2⁴ = 128257439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254734 + ... + 255236.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^128257455 is an apocalyptic number.

128257455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128257455 is a deficient number, since it is larger than the sum of its proper divisors (80761425).

128257455 is a wasteful number, since it uses less digits than its factorization.

128257455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791.

The product of its digits is 112000, while the sum is 39.

The square root of 128257455 is about 11325.0807944138. The cubic root of 128257455 is about 504.3060821859.

The spelling of 128257455 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, four hundred fifty-five".