1728717445999 has 4 divisors (see below), whose sum is σ = 1729526394064. Its totient is φ = 1727908497936.

The previous prime is 1728717445981. The next prime is 1728717446009. The reversal of 1728717445999 is 9995447178271.

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

It is a cyclic number.

It is not a de Polignac number, because 1728717445999 - 2⁹ = 1728717445487 is a prime.

It is a super-2 number, since 2×1728717445999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728717445199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404470827 + ... + 404475100.

It is an arithmetic number, because the mean of its divisors is an integer number (432381598516).

Almost surely, 2^{1728717445999} is an apocalyptic number.

1728717445999 is a deficient number, since it is larger than the sum of its proper divisors (808948065).

1728717445999 is an equidigital number, since it uses as much as digits as its factorization.

1728717445999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808948064.

The product of its digits is 320060160, while the sum is 73.

The spelling of 1728717445999 in words is "one trillion, seven hundred twenty-eight billion, seven hundred seventeen million, four hundred forty-five thousand, nine hundred ninety-nine".