1728345845 has 8 divisors (see below), whose sum is σ = 2084438400. Its totient is φ = 1375727760.

The previous prime is 1728345803. The next prime is 1728345863. The reversal of 1728345845 is 5485438271.

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

It is not a de Polignac number, because 1728345845 - 2¹⁴ = 1728329461 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1728345845.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867521 + ... + 869510.

It is an arithmetic number, because the mean of its divisors is an integer number (260554800).

Almost surely, 2^1728345845 is an apocalyptic number.

It is an amenable number.

1728345845 is a deficient number, since it is larger than the sum of its proper divisors (356092555).

1728345845 is a wasteful number, since it uses less digits than its factorization.

1728345845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737235.

The product of its digits is 1075200, while the sum is 47.

The square root of 1728345845 is about 41573.3790423632. The cubic root of 1728345845 is about 1200.0800513727.

The spelling of 1728345845 in words is "one billion, seven hundred twenty-eight million, three hundred forty-five thousand, eight hundred forty-five".