128609535 has 16 divisors (see below), whose sum is σ = 209659104. Its totient is φ = 67297152.

The previous prime is 128609527. The next prime is 128609561. The reversal of 128609535 is 535906821.

It is not a de Polignac number, because 128609535 - 2³ = 128609527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128609493 and 128609502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80092 + ... + 81681.

It is an arithmetic number, because the mean of its divisors is an integer number (13103694).

Almost surely, 2^128609535 is an apocalyptic number.

128609535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128609535 is a deficient number, since it is larger than the sum of its proper divisors (81049569).

128609535 is a wasteful number, since it uses less digits than its factorization.

128609535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161834.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 128609535 is about 11340.6144013453. The cubic root of 128609535 is about 504.7671180579.

The spelling of 128609535 in words is "one hundred twenty-eight million, six hundred nine thousand, five hundred thirty-five".