1728731442999 has 72 divisors (see below), whose sum is σ = 2694370162176. Its totient is φ = 984986402400.

The previous prime is 1728731442953. The next prime is 1728731443009. The reversal of 1728731442999 is 9992441378271.

It is not a de Polignac number, because 1728731442999 - 2⁷ = 1728731442871 is a prime.

It is a super-2 number, since 2×1728731442999² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728731442499) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17116282 + ... + 17216984.

It is an arithmetic number, because the mean of its divisors is an integer number (37421807808).

Almost surely, 2^{1728731442999} is an apocalyptic number.

1728731442999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1728731442999 is a deficient number, since it is larger than the sum of its proper divisors (965638719177).

1728731442999 is a wasteful number, since it uses less digits than its factorization.

1728731442999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100897 (or 100867 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 66.

The spelling of 1728731442999 in words is "one trillion, seven hundred twenty-eight billion, seven hundred thirty-one million, four hundred forty-two thousand, nine hundred ninety-nine".