1728704338 has 4 divisors (see below), whose sum is σ = 2593056510. Its totient is φ = 864352168.

The previous prime is 1728704333. The next prime is 1728704363. The reversal of 1728704338 is 8334078271.

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

It can be written as a sum of positive squares in only one way, i.e., 1679606289 + 49098049 = 40983^2 + 7007^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1728704294 and 1728704303.

It is not an unprimeable number, because it can be changed into a prime (1728704333) 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 as a sum of consecutive naturals, namely, 432176083 + ... + 432176086.

Almost surely, 2^1728704338 is an apocalyptic number.

1728704338 is a deficient number, since it is larger than the sum of its proper divisors (864352172).

1728704338 is an equidigital number, since it uses as much as digits as its factorization.

1728704338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864352171.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 1728704338 is about 41577.6903879953. The cubic root of 1728704338 is about 1200.1630190567.

The spelling of 1728704338 in words is "one billion, seven hundred twenty-eight million, seven hundred four thousand, three hundred thirty-eight".