1728088385 has 4 divisors (see below), whose sum is σ = 2073706068. Its totient is φ = 1382470704.

The previous prime is 1728088381. The next prime is 1728088387. The reversal of 1728088385 is 5838808271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5838808271 = 463 ⋅12610817.

It can be written as a sum of positive squares in 2 ways, for example, as 973377601 + 754710784 = 31199^2 + 27472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728088385 - 2² = 1728088381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1728088381) 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, 172808834 + ... + 172808843.

It is an arithmetic number, because the mean of its divisors is an integer number (518426517).

Almost surely, 2^1728088385 is an apocalyptic number.

It is an amenable number.

1728088385 is a deficient number, since it is larger than the sum of its proper divisors (345617683).

1728088385 is an equidigital number, since it uses as much as digits as its factorization.

1728088385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345617682.

The product of its (nonzero) digits is 860160, while the sum is 50.

The square root of 1728088385 is about 41570.2824743831. The cubic root of 1728088385 is about 1200.0204591419.

The spelling of 1728088385 in words is "one billion, seven hundred twenty-eight million, eighty-eight thousand, three hundred eighty-five".