17728745743 has 4 divisors (see below), whose sum is σ = 17731540080. Its totient is φ = 17725951408.

The previous prime is 17728745729. The next prime is 17728745773. The reversal of 17728745743 is 34754782771.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34754782771 = 409 ⋅84975019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17728745743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17728745773) 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, 1387630 + ... + 1400347.

It is an arithmetic number, because the mean of its divisors is an integer number (4432885020).

Almost surely, 2^17728745743 is an apocalyptic number.

17728745743 is a deficient number, since it is larger than the sum of its proper divisors (2794337).

17728745743 is an equidigital number, since it uses as much as digits as its factorization.

17728745743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794336.

The product of its digits is 9219840, while the sum is 55.

The spelling of 17728745743 in words is "seventeen billion, seven hundred twenty-eight million, seven hundred forty-five thousand, seven hundred forty-three".