128256415 has 32 divisors (see below), whose sum is σ = 192689280. Its totient is φ = 79908864.

The previous prime is 128256409. The next prime is 128256451. The reversal of 128256415 is 514652821.

It is a happy number.

It is not a de Polignac number, because 128256415 - 2⁷ = 128256287 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13539 + ... + 20971.

It is an arithmetic number, because the mean of its divisors is an integer number (6021540).

Almost surely, 2^128256415 is an apocalyptic number.

128256415 is a deficient number, since it is larger than the sum of its proper divisors (64432865).

128256415 is a wasteful number, since it uses less digits than its factorization.

128256415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7491.

The product of its digits is 19200, while the sum is 34.

The square root of 128256415 is about 11325.0348785335. The cubic root of 128256415 is about 504.3047190950.

The spelling of 128256415 in words is "one hundred twenty-eight million, two hundred fifty-six thousand, four hundred fifteen".