16728385 has 8 divisors (see below), whose sum is σ = 20221416. Its totient is φ = 13284480.

The previous prime is 16728377. The next prime is 16728421. The reversal of 16728385 is 58382761.

16728385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 16719921 = 92^2 + 4089^2 .

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

It is not a de Polignac number, because 16728385 - 2³ = 16728377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11526 + ... + 12895.

It is an arithmetic number, because the mean of its divisors is an integer number (2527677).

Almost surely, 2^16728385 is an apocalyptic number.

It is an amenable number.

16728385 is a deficient number, since it is larger than the sum of its proper divisors (3493031).

16728385 is a wasteful number, since it uses less digits than its factorization.

16728385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24563.

The product of its digits is 80640, while the sum is 40.

The square root of 16728385 is about 4090.0348409274. The cubic root of 16728385 is about 255.7513913379.

The spelling of 16728385 in words is "sixteen million, seven hundred twenty-eight thousand, three hundred eighty-five".