328747729 has 4 divisors (see below), whose sum is σ = 328813876. Its totient is φ = 328681584.

The previous prime is 328747721. The next prime is 328747733. The reversal of 328747729 is 927747823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98406400 + 230341329 = 9920^2 + 15177^2 .

It is a cyclic number.

It is not a de Polignac number, because 328747729 - 2³ = 328747721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328747721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24954 + ... + 35779.

It is an arithmetic number, because the mean of its divisors is an integer number (82203469).

Almost surely, 2^328747729 is an apocalyptic number.

It is an amenable number.

328747729 is a deficient number, since it is larger than the sum of its proper divisors (66147).

328747729 is an equidigital number, since it uses as much as digits as its factorization.

328747729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66146.

The product of its digits is 1185408, while the sum is 49.

The square root of 328747729 is about 18131.4017384206. The cubic root of 328747729 is about 690.1671015857.

It can be divided in two parts, 328747 and 729, that added together give a square (329476 = 574²).

The spelling of 328747729 in words is "three hundred twenty-eight million, seven hundred forty-seven thousand, seven hundred twenty-nine".