16648009 has 32 divisors (see below), whose sum is σ = 21288960. Its totient is φ = 12700800.

The previous prime is 16648003. The next prime is 16648031. The reversal of 16648009 is 90084661.

It is not a de Polignac number, because 16648009 - 2⁷ = 16647881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16648003) 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 in 31 ways as a sum of consecutive naturals, for example, 234444 + ... + 234514.

It is an arithmetic number, because the mean of its divisors is an integer number (665280).

Almost surely, 2^16648009 is an apocalyptic number.

16648009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16648009 is a deficient number, since it is larger than the sum of its proper divisors (4640951).

16648009 is a wasteful number, since it uses less digits than its factorization.

16648009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 16648009 is about 4080.1971766080. The cubic root of 16648009 is about 255.3411249015.

It can be divided in two parts, 16 and 648009, that added together give a square (648025 = 805²).

The spelling of 16648009 in words is "sixteen million, six hundred forty-eight thousand, nine".