128336765 has 8 divisors (see below), whose sum is σ = 157760568. Its totient is φ = 100165120.

The previous prime is 128336759. The next prime is 128336777. The reversal of 128336765 is 567633821.

It can be written as a sum of positive squares in 4 ways, for example, as 850084 + 127486681 = 922^2 + 11291^2 .

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

It is not a de Polignac number, because 128336765 - 2⁴ = 128336749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent 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, 312812 + ... + 313221.

It is an arithmetic number, because the mean of its divisors is an integer number (19720071).

Almost surely, 2^128336765 is an apocalyptic number.

It is an amenable number.

128336765 is a deficient number, since it is larger than the sum of its proper divisors (29423803).

128336765 is an equidigital number, since it uses as much as digits as its factorization.

128336765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626079.

The product of its digits is 181440, while the sum is 41.

The square root of 128336765 is about 11328.5817735496. The cubic root of 128336765 is about 504.4100092807.

The spelling of 128336765 in words is "one hundred twenty-eight million, three hundred thirty-six thousand, seven hundred sixty-five".