1728329545 has 4 divisors (see below), whose sum is σ = 2073995460. Its totient is φ = 1382663632.

The previous prime is 1728329513. The next prime is 1728329563. The reversal of 1728329545 is 5459238271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 271227961 + 1457101584 = 16469^2 + 38172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728329545 - 2⁵ = 1728329513 is a prime.

It is a super-2 number, since 2×1728329545² = 5974246032239814050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1728329495 and 1728329504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172832950 + ... + 172832959.

It is an arithmetic number, because the mean of its divisors is an integer number (518498865).

Almost surely, 2^1728329545 is an apocalyptic number.

It is an amenable number.

1728329545 is a deficient number, since it is larger than the sum of its proper divisors (345665915).

1728329545 is an equidigital number, since it uses as much as digits as its factorization.

1728329545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345665914.

The product of its digits is 604800, while the sum is 46.

The square root of 1728329545 is about 41573.1830029888. The cubic root of 1728329545 is about 1200.0762787160.

The spelling of 1728329545 in words is "one billion, seven hundred twenty-eight million, three hundred twenty-nine thousand, five hundred forty-five".