128380365 has 36 divisors (see below), whose sum is σ = 232664796. Its totient is φ = 65480448.

The previous prime is 128380289. The next prime is 128380381. The reversal of 128380365 is 563083821.

It can be written as a sum of positive squares in 2 ways, for example, as 90668484 + 37711881 = 9522^2 + 6141^2 .

It is not a de Polignac number, because 128380365 - 2¹⁰ = 128379341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21109 + ... + 26501.

It is an arithmetic number, because the mean of its divisors is an integer number (6462911).

Almost surely, 2^128380365 is an apocalyptic number.

128380365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128380365 is a deficient number, since it is larger than the sum of its proper divisors (104284431).

128380365 is a wasteful number, since it uses less digits than its factorization.

128380365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450 (or 5424 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 128380365 is about 11330.5059463380. The cubic root of 128380365 is about 504.4671240818.

The spelling of 128380365 in words is "one hundred twenty-eight million, three hundred eighty thousand, three hundred sixty-five".