1728386306 has 8 divisors (see below), whose sum is σ = 2594576124. Its totient is φ = 863527600.

The previous prime is 1728386279. The next prime is 1728386323. The reversal of 1728386306 is 6036838271.

It can be written as a sum of positive squares in 2 ways, for example, as 1513910281 + 214476025 = 38909^2 + 14645^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329525 + ... + 334728.

Almost surely, 2^1728386306 is an apocalyptic number.

1728386306 is a deficient number, since it is larger than the sum of its proper divisors (866189818).

1728386306 is a wasteful number, since it uses less digits than its factorization.

1728386306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665556.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1728386306 is about 41573.8656610135. The cubic root of 1728386306 is about 1200.0894160223.

The spelling of 1728386306 in words is "one billion, seven hundred twenty-eight million, three hundred eighty-six thousand, three hundred six".