128765749 has 8 divisors (see below), whose sum is σ = 147548160. Its totient is φ = 110080176.

The previous prime is 128765743. The next prime is 128765783. The reversal of 128765749 is 947567821.

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

It is a cyclic number.

It is not a de Polignac number, because 128765749 - 2⁷ = 128765621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128765743) by changing a digit.

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, 21334 + ... + 26695.

It is an arithmetic number, because the mean of its divisors is an integer number (18443520).

Almost surely, 2^128765749 is an apocalyptic number.

It is an amenable number.

128765749 is a deficient number, since it is larger than the sum of its proper divisors (18782411).

128765749 is an equidigital number, since it uses as much as digits as its factorization.

128765749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48419.

The product of its digits is 846720, while the sum is 49.

The square root of 128765749 is about 11347.4996805464. The cubic root of 128765749 is about 504.9714051057.

The spelling of 128765749 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, seven hundred forty-nine".