1728190085 has 8 divisors (see below), whose sum is σ = 2107825656. Its totient is φ = 1359887040.

The previous prime is 1728190073. The next prime is 1728190099. The reversal of 1728190085 is 5800918271.

It can be written as a sum of positive squares in 4 ways, for example, as 17623204 + 1710566881 = 4198^2 + 41359^2 .

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

It is not a de Polignac number, because 1728190085 - 2¹² = 1728185989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 2832794 + ... + 2833403.

It is an arithmetic number, because the mean of its divisors is an integer number (263478207).

Almost surely, 2^1728190085 is an apocalyptic number.

It is an amenable number.

1728190085 is a deficient number, since it is larger than the sum of its proper divisors (379635571).

1728190085 is an equidigital number, since it uses as much as digits as its factorization.

1728190085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666263.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 1728190085 is about 41571.5056859864. The cubic root of 1728190085 is about 1200.0439995441.

The spelling of 1728190085 in words is "one billion, seven hundred twenty-eight million, one hundred ninety thousand, eighty-five".