16728979 has 4 divisors (see below), whose sum is σ = 16788376. Its totient is φ = 16669584.

The previous prime is 16728977. The next prime is 16728983. The reversal of 16728979 is 97982761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97982761 = 367 ⋅266983.

It is a cyclic number.

It is not a de Polignac number, because 16728979 - 2¹ = 16728977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16728977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29274 + ... + 29839.

It is an arithmetic number, because the mean of its divisors is an integer number (4197094).

Almost surely, 2^16728979 is an apocalyptic number.

16728979 is a deficient number, since it is larger than the sum of its proper divisors (59397).

16728979 is an equidigital number, since it uses as much as digits as its factorization.

16728979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59396.

The product of its digits is 381024, while the sum is 49.

The square root of 16728979 is about 4090.1074558011. The cubic root of 16728979 is about 255.7544184188.

The spelling of 16728979 in words is "sixteen million, seven hundred twenty-eight thousand, nine hundred seventy-nine".