128057155 has 4 divisors (see below), whose sum is σ = 153668592. Its totient is φ = 102445720.

The previous prime is 128057147. The next prime is 128057159. The reversal of 128057155 is 551750821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128057155 - 2³ = 128057147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128057155.

It is not an unprimeable number, because it can be changed into a prime (128057159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12805711 + ... + 12805720.

It is an arithmetic number, because the mean of its divisors is an integer number (38417148).

Almost surely, 2^128057155 is an apocalyptic number.

128057155 is a deficient number, since it is larger than the sum of its proper divisors (25611437).

128057155 is an equidigital number, since it uses as much as digits as its factorization.

128057155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25611436.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 128057155 is about 11316.2341350822. The cubic root of 128057155 is about 504.0434200330.

The spelling of 128057155 in words is "one hundred twenty-eight million, fifty-seven thousand, one hundred fifty-five".