16688004 has 48 divisors (see below), whose sum is σ = 41791680. Its totient is φ = 5166720.

The previous prime is 16688003. The next prime is 16688011. The reversal of 16688004 is 40088661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688003) 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, 11394 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (870660).

Almost surely, 2^16688004 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 16688004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20895840).

16688004 is an abundant number, since it is smaller than the sum of its proper divisors (25103676).

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

16688004 is a wasteful number, since it uses less digits than its factorization.

16688004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 16688004 is about 4085.0953477245. The cubic root of 16688004 is about 255.5454376446.

The spelling of 16688004 in words is "sixteen million, six hundred eighty-eight thousand, four".