128765265 has 8 divisors (see below), whose sum is σ = 206024448. Its totient is φ = 68674800.

The previous prime is 128765257. The next prime is 128765279. The reversal of 128765265 is 562567821.

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

It is not a de Polignac number, because 128765265 - 2³ = 128765257 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292161 + ... + 4292190.

It is an arithmetic number, because the mean of its divisors is an integer number (25753056).

Almost surely, 2^128765265 is an apocalyptic number.

128765265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128765265 is a deficient number, since it is larger than the sum of its proper divisors (77259183).

128765265 is an equidigital number, since it uses as much as digits as its factorization.

128765265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8584359.

The product of its digits is 201600, while the sum is 42.

The square root of 128765265 is about 11347.4783542424. The cubic root of 128765265 is about 504.9707724156.

The spelling of 128765265 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, two hundred sixty-five".