136728329 has 4 divisors (see below), whose sum is σ = 137726484. Its totient is φ = 135730176.

The previous prime is 136728289. The next prime is 136728349. The reversal of 136728329 is 923827631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923827631 = 4547 ⋅203173.

It can be written as a sum of positive squares in 2 ways, for example, as 120406729 + 16321600 = 10973^2 + 4040^2 .

It is a cyclic number.

It is not a de Polignac number, because 136728329 - 2¹² = 136724233 is a prime.

It is a super-2 number, since 2×136728329² = 37389271902264482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136728349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498872 + ... + 499145.

It is an arithmetic number, because the mean of its divisors is an integer number (34431621).

Almost surely, 2^136728329 is an apocalyptic number.

It is an amenable number.

136728329 is a deficient number, since it is larger than the sum of its proper divisors (998155).

136728329 is an equidigital number, since it uses as much as digits as its factorization.

136728329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998154.

The product of its digits is 108864, while the sum is 41.

The square root of 136728329 is about 11693.0889417638. The cubic root of 136728329 is about 515.1726935221.

The spelling of 136728329 in words is "one hundred thirty-six million, seven hundred twenty-eight thousand, three hundred twenty-nine".