128379265 has 12 divisors (see below), whose sum is σ = 179207316. Its totient is φ = 88031328.

The previous prime is 128379263. The next prime is 128379269. The reversal of 128379265 is 562973821.

It can be written as a sum of positive squares in 2 ways, for example, as 79281216 + 49098049 = 8904^2 + 7007^2 .

It is not a de Polignac number, because 128379265 - 2¹ = 128379263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128379263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261754 + ... + 262243.

It is an arithmetic number, because the mean of its divisors is an integer number (14933943).

Almost surely, 2^128379265 is an apocalyptic number.

It is an amenable number.

128379265 is a deficient number, since it is larger than the sum of its proper divisors (50828051).

128379265 is an equidigital number, since it uses as much as digits as its factorization.

128379265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524016 (or 524009 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 128379265 is about 11330.4574047123. The cubic root of 128379265 is about 504.4656832710.

The spelling of 128379265 in words is "one hundred twenty-eight million, three hundred seventy-nine thousand, two hundred sixty-five".