1728045317 has 4 divisors (see below), whose sum is σ = 1744822560. Its totient is φ = 1711268076.

The previous prime is 1728045313. The next prime is 1728045367. The reversal of 1728045317 is 7135408271.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7135408271 = 63907 ⋅111653.

It is a cyclic number.

It is not a de Polignac number, because 1728045317 - 2² = 1728045313 is a prime.

It is a super-2 number, since 2×1728045317² = 5972281235211260978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728045311) 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, 8388467 + ... + 8388672.

It is an arithmetic number, because the mean of its divisors is an integer number (436205640).

Almost surely, 2^1728045317 is an apocalyptic number.

It is an amenable number.

1728045317 is a deficient number, since it is larger than the sum of its proper divisors (16777243).

1728045317 is a wasteful number, since it uses less digits than its factorization.

1728045317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16777242.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 1728045317 is about 41569.7644568742. The cubic root of 1728045317 is about 1200.0104899546.

The spelling of 1728045317 in words is "one billion, seven hundred twenty-eight million, forty-five thousand, three hundred seventeen".