1728681049 has 4 divisors (see below), whose sum is σ = 1730782336. Its totient is φ = 1726579764.

The previous prime is 1728681043. The next prime is 1728681067. The reversal of 1728681049 is 9401868271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1728681049 - 2³ = 1728681041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1728681041) 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, 1049409 + ... + 1051054.

It is an arithmetic number, because the mean of its divisors is an integer number (432695584).

Almost surely, 2^1728681049 is an apocalyptic number.

It is an amenable number.

1728681049 is a deficient number, since it is larger than the sum of its proper divisors (2101287).

1728681049 is an equidigital number, since it uses as much as digits as its factorization.

1728681049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101286.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1728681049 is about 41577.4103209904. The cubic root of 1728681049 is about 1200.1576295247.

The spelling of 1728681049 in words is "one billion, seven hundred twenty-eight million, six hundred eighty-one thousand, forty-nine".