1728999999 has 30 divisors (see below), whose sum is σ = 2700073376. Its totient is φ = 1102523400.

The previous prime is 1728999997. The next prime is 1729000027. The reversal of 1728999999 is 9999998271.

It is not a de Polignac number, because 1728999999 - 2¹ = 1728999997 is a prime.

It is a Duffinian number.

1728999999 is a modest number, since divided by 99999 gives 17289 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728999997) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 22674 + ... + 63024.

Almost surely, 2^1728999999 is an apocalyptic number.

1728999999 is a deficient number, since it is larger than the sum of its proper divisors (971073377).

1728999999 is an equidigital number, since it uses as much as digits as its factorization.

1728999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40409 (or 40377 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 72.

The square root of 1728999999 is about 41581.2457605589. The cubic root of 1728999999 is about 1200.2314366114.

It can be divided in two parts, 1 and 728999999, that added together give a 6-th power (729000000 = 30⁶).

The spelling of 1728999999 in words is "one billion, seven hundred twenty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".