128688765 has 8 divisors (see below), whose sum is σ = 205902048. Its totient is φ = 68634000.

The previous prime is 128688757. The next prime is 128688799. The reversal of 128688765 is 567886821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128688765 - 2³ = 128688757 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4289611 + ... + 4289640.

It is an arithmetic number, because the mean of its divisors is an integer number (25737756).

Almost surely, 2^128688765 is an apocalyptic number.

128688765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128688765 is a deficient number, since it is larger than the sum of its proper divisors (77213283).

128688765 is an equidigital number, since it uses as much as digits as its factorization.

128688765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8579259.

The product of its digits is 1290240, while the sum is 51.

The square root of 128688765 is about 11344.1070604962. The cubic root of 128688765 is about 504.8707508330.

The spelling of 128688765 in words is "one hundred twenty-eight million, six hundred eighty-eight thousand, seven hundred sixty-five".