16728109 has 2 divisors, whose sum is σ = 16728110. Its totient is φ = 16728108.

The previous prime is 16728083. The next prime is 16728137. The reversal of 16728109 is 90182761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 9 = 4090^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 16728109 - 2⁵ = 16728077 is a prime.

It is equal to p_1074895 and since 16728109 and 1074895 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16728149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8364054 + 8364055.

It is an arithmetic number, because the mean of its divisors is an integer number (8364055).

Almost surely, 2^16728109 is an apocalyptic number.

It is an amenable number.

16728109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16728109 is an equidigital number, since it uses as much as digits as its factorization.

16728109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 16728109 is about 4090.0011002444. The cubic root of 16728109 is about 255.7499847910.

The spelling of 16728109 in words is "sixteen million, seven hundred twenty-eight thousand, one hundred nine".