128916775 has 12 divisors (see below), whose sum is σ = 172153912. Its totient is φ = 95199840.

The previous prime is 128916743. The next prime is 128916793. The reversal of 128916775 is 577619821.

It is a happy number.

It is not a de Polignac number, because 128916775 - 2⁵ = 128916743 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 198009 + ... + 198658.

Almost surely, 2^128916775 is an apocalyptic number.

128916775 is a deficient number, since it is larger than the sum of its proper divisors (43237137).

128916775 is a wasteful number, since it uses less digits than its factorization.

128916775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396690 (or 396685 counting only the distinct ones).

The product of its digits is 211680, while the sum is 46.

The square root of 128916775 is about 11354.1523241500. The cubic root of 128916775 is about 505.1687505838.

The spelling of 128916775 in words is "one hundred twenty-eight million, nine hundred sixteen thousand, seven hundred seventy-five".