1728423331603 has 4 divisors (see below), whose sum is σ = 1738773172080. Its totient is φ = 1718073491128.

The previous prime is 1728423331597. The next prime is 1728423331637. The reversal of 1728423331603 is 3061333248271.

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 1728423331603 - 2¹⁷ = 1728423200531 is a prime.

It is a super-2 number, since 2×1728423331603² (a number of 25 digits) contains 22 as substring.

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 1728423331603.

It is not an unprimeable number, because it can be changed into a prime (1728423331643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5174919988 + ... + 5174920321.

It is an arithmetic number, because the mean of its divisors is an integer number (434693293020).

Almost surely, 2^{1728423331603} is an apocalyptic number.

1728423331603 is a deficient number, since it is larger than the sum of its proper divisors (10349840477).

1728423331603 is a wasteful number, since it uses less digits than its factorization.

1728423331603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349840476.

The product of its (nonzero) digits is 435456, while the sum is 43.

Adding to 1728423331603 its reverse (3061333248271), we get a palindrome (4789756579874).

The spelling of 1728423331603 in words is "one trillion, seven hundred twenty-eight billion, four hundred twenty-three million, three hundred thirty-one thousand, six hundred three".