128257065 has 12 divisors (see below), whose sum is σ = 222312324. Its totient is φ = 68403744.

The previous prime is 128257057. The next prime is 128257079. The reversal of 128257065 is 560752821.

It is a happy number.

128257065 is a `hidden beast` number, since 1 + 2 + 82 + 570 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51151104 + 77105961 = 7152^2 + 8781^2 .

It is not a de Polignac number, because 128257065 - 2³ = 128257057 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1425034 + ... + 1425123.

It is an arithmetic number, because the mean of its divisors is an integer number (18526027).

Almost surely, 2^128257065 is an apocalyptic number.

128257065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128257065 is a deficient number, since it is larger than the sum of its proper divisors (94055259).

128257065 is a wasteful number, since it uses less digits than its factorization.

128257065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850168 (or 2850165 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 128257065 is about 11325.0635759805. The cubic root of 128257065 is about 504.3055710277.

The spelling of 128257065 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, sixty-five".