1728280745 has 8 divisors (see below), whose sum is σ = 2104891584. Its totient is φ = 1361988144.

The previous prime is 1728280733. The next prime is 1728280751. The reversal of 1728280745 is 5470828271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1728280745 - 2⁶ = 1728280681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1728280696 and 1728280705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2579189 + ... + 2579858.

It is an arithmetic number, because the mean of its divisors is an integer number (263111448).

Almost surely, 2^1728280745 is an apocalyptic number.

It is an amenable number.

1728280745 is a deficient number, since it is larger than the sum of its proper divisors (376610839).

1728280745 is an equidigital number, since it uses as much as digits as its factorization.

1728280745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159119.

The product of its (nonzero) digits is 250880, while the sum is 44.

The square root of 1728280745 is about 41572.5960820346. The cubic root of 1728280745 is about 1200.0649837494.

The spelling of 1728280745 in words is "one billion, seven hundred twenty-eight million, two hundred eighty thousand, seven hundred forty-five".