128613605 has 4 divisors (see below), whose sum is σ = 154336332. Its totient is φ = 102890880.

The previous prime is 128613601. The next prime is 128613607. The reversal of 128613605 is 506316821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14508481 + 114105124 = 3809^2 + 10682^2 .

It is not a de Polignac number, because 128613605 - 2² = 128613601 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 (128613601) 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 3 ways as a sum of consecutive naturals, for example, 12861356 + ... + 12861365.

It is an arithmetic number, because the mean of its divisors is an integer number (38584083).

Almost surely, 2^128613605 is an apocalyptic number.

It is an amenable number.

128613605 is a deficient number, since it is larger than the sum of its proper divisors (25722727).

128613605 is an equidigital number, since it uses as much as digits as its factorization.

128613605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25722726.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 128613605 is about 11340.7938434662. The cubic root of 128613605 is about 504.7724426514.

The spelling of 128613605 in words is "one hundred twenty-eight million, six hundred thirteen thousand, six hundred five".