16678649 has 16 divisors (see below), whose sum is σ = 19176192. Its totient is φ = 14370048.

The previous prime is 16678639. The next prime is 16678661. The reversal of 16678649 is 94687661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16678649 - 2⁴ = 16678633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16678639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35792 + ... + 36254.

It is an arithmetic number, because the mean of its divisors is an integer number (1198512).

Almost surely, 2^16678649 is an apocalyptic number.

It is an amenable number.

16678649 is a deficient number, since it is larger than the sum of its proper divisors (2497543).

16678649 is a wasteful number, since it uses less digits than its factorization.

16678649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656.

The product of its digits is 435456, while the sum is 47.

The square root of 16678649 is about 4083.9501710966. The cubic root of 16678649 is about 255.4976773009.

The spelling of 16678649 in words is "sixteen million, six hundred seventy-eight thousand, six hundred forty-nine".