1728709023 has 4 divisors (see below), whose sum is σ = 2304945368. Its totient is φ = 1152472680.

The previous prime is 1728709007. The next prime is 1728709043. The reversal of 1728709023 is 3209078271.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1728709023 - 2⁴ = 1728709007 is a prime.

It is a super-2 number, since 2×1728709023² = 5976869772403229058, 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 (1728709043) 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, 288118168 + ... + 288118173.

It is an arithmetic number, because the mean of its divisors is an integer number (576236342).

Almost surely, 2^1728709023 is an apocalyptic number.

1728709023 is a deficient number, since it is larger than the sum of its proper divisors (576236345).

1728709023 is an equidigital number, since it uses as much as digits as its factorization.

1728709023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576236344.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1728709023 is about 41577.7467282680. The cubic root of 1728709023 is about 1200.1641032519.

The spelling of 1728709023 in words is "one billion, seven hundred twenty-eight million, seven hundred nine thousand, twenty-three".