128725789605 has 32 divisors (see below), whose sum is σ = 241125389568. Its totient is φ = 57410803200.

The previous prime is 128725789597. The next prime is 128725789639. The reversal of 128725789605 is 506987527821.

It is not a de Polignac number, because 128725789605 - 2³ = 128725789597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14946426 + ... + 14955035.

It is an arithmetic number, because the mean of its divisors is an integer number (7535168424).

Almost surely, 2^128725789605 is an apocalyptic number.

128725789605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128725789605 is a deficient number, since it is larger than the sum of its proper divisors (112399599963).

128725789605 is a wasteful number, since it uses less digits than its factorization.

128725789605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29901517.

The product of its (nonzero) digits is 16934400, while the sum is 60.

The spelling of 128725789605 in words is "one hundred twenty-eight billion, seven hundred twenty-five million, seven hundred eighty-nine thousand, six hundred five".