16728125 has 24 divisors (see below), whose sum is σ = 21514248. Its totient is φ = 13000000.

The previous prime is 16728109. The next prime is 16728137. The reversal of 16728125 is 52182761.

It can be written as a sum of positive squares in 12 ways, for example, as 13623481 + 3104644 = 3691^2 + 1762^2 .

It is not a de Polignac number, because 16728125 - 2⁴ = 16728109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16728091 and 16728100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165575 + ... + 165675.

It is an arithmetic number, because the mean of its divisors is an integer number (896427).

Almost surely, 2^16728125 is an apocalyptic number.

It is an amenable number.

16728125 is a deficient number, since it is larger than the sum of its proper divisors (4786123).

16728125 is an frugal number, since it uses more digits than its factorization.

16728125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 159 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 16728125 is about 4090.0030562336. The cubic root of 16728125 is about 255.7500663304.

It can be divided in two parts, 167281 and 25, that multiplied together give a square (4182025 = 2045²).

The spelling of 16728125 in words is "sixteen million, seven hundred twenty-eight thousand, one hundred twenty-five".