1728324865 has 32 divisors (see below), whose sum is σ = 2203149312. Its totient is φ = 1300809600.

The previous prime is 1728324863. The next prime is 1728324877. The reversal of 1728324865 is 5684238271.

It is not a de Polignac number, because 1728324865 - 2¹ = 1728324863 is a prime.

It is a Duffinian number.

Its product of digits (645120) is a multiple of the sum of its prime divisors (360).

It is not an unprimeable number, because it can be changed into a prime (1728324863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6107014 + ... + 6107296.

It is an arithmetic number, because the mean of its divisors is an integer number (68848416).

Almost surely, 2^1728324865 is an apocalyptic number.

It is an amenable number.

1728324865 is a deficient number, since it is larger than the sum of its proper divisors (474824447).

1728324865 is an frugal number, since it uses more digits than its factorization.

1728324865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 360 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 1728324865 is about 41573.1267166664. The cubic root of 1728324865 is about 1200.0751955194.

The spelling of 1728324865 in words is "one billion, seven hundred twenty-eight million, three hundred twenty-four thousand, eight hundred sixty-five".