16809688 has 64 divisors (see below), whose sum is σ = 38891520. Its totient is φ = 6652800.

The previous prime is 16809679. The next prime is 16809739. The reversal of 16809688 is 88690861.

It is a super-2 number, since 2×16809688² = 565131221314688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39718 + ... + 40138.

It is an arithmetic number, because the mean of its divisors is an integer number (607680).

Almost surely, 2^16809688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16809688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19445760).

16809688 is an abundant number, since it is smaller than the sum of its proper divisors (22081832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16809688 is a wasteful number, since it uses less digits than its factorization.

16809688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 16809688 is about 4099.9619510430. The cubic root of 16809688 is about 256.1650546918.

The spelling of 16809688 in words is "sixteen million, eight hundred nine thousand, six hundred eighty-eight".