128609753 has 4 divisors (see below), whose sum is σ = 129015780. Its totient is φ = 128203728.

The previous prime is 128609749. The next prime is 128609779. The reversal of 128609753 is 357906821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 357906821 = 113 ⋅3167317.

It can be written as a sum of positive squares in 2 ways, for example, as 10843849 + 117765904 = 3293^2 + 10852^2 .

It is a cyclic number.

It is not a de Polignac number, because 128609753 - 2² = 128609749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128609753.

It is not an unprimeable number, because it can be changed into a prime (128609053) 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, 202538 + ... + 203171.

It is an arithmetic number, because the mean of its divisors is an integer number (32253945).

Almost surely, 2^128609753 is an apocalyptic number.

It is an amenable number.

128609753 is a deficient number, since it is larger than the sum of its proper divisors (406027).

128609753 is an equidigital number, since it uses as much as digits as its factorization.

128609753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406026.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 128609753 is about 11340.6240128134. The cubic root of 128609753 is about 504.7674032601.

The spelling of 128609753 in words is "one hundred twenty-eight million, six hundred nine thousand, seven hundred fifty-three".