128749605 has 16 divisors (see below), whose sum is σ = 216841920. Its totient is φ = 65052288.

The previous prime is 128749597. The next prime is 128749627. The reversal of 128749605 is 506947821.

It is not a de Polignac number, because 128749605 - 2³ = 128749597 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225592 + ... + 226161.

It is an arithmetic number, because the mean of its divisors is an integer number (13552620).

Almost surely, 2^128749605 is an apocalyptic number.

128749605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128749605 is a deficient number, since it is larger than the sum of its proper divisors (88092315).

128749605 is a wasteful number, since it uses less digits than its factorization.

128749605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451780.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 128749605 is about 11346.7883121172. The cubic root of 128749605 is about 504.9503006346.

The spelling of 128749605 in words is "one hundred twenty-eight million, seven hundred forty-nine thousand, six hundred five".