16688646 has 32 divisors (see below), whose sum is σ = 39940320. Its totient is φ = 5134752.

The previous prime is 16688627. The next prime is 16688647. The reversal of 16688646 is 64688661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688647) 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 15 ways as a sum of consecutive naturals, for example, 11185 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (1248135).

Almost surely, 2^16688646 is an apocalyptic number.

16688646 is an abundant number, since it is smaller than the sum of its proper divisors (23251674).

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

16688646 is a wasteful number, since it uses less digits than its factorization.

16688646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23797 (or 23791 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 16688646 is about 4085.1739253060. The cubic root of 16688646 is about 255.5487146107.

The spelling of 16688646 in words is "sixteen million, six hundred eighty-eight thousand, six hundred forty-six".