16688388 has 12 divisors (see below), whose sum is σ = 38939600. Its totient is φ = 5562792.

The previous prime is 16688387. The next prime is 16688389. The reversal of 16688388 is 88388661.

It is a happy number.

16688388 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16688387) and next prime (16688389).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (16688387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695338 + ... + 695361.

Almost surely, 2^16688388 is an apocalyptic number.

It is an amenable number.

16688388 is an abundant number, since it is smaller than the sum of its proper divisors (22251212).

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

16688388 is a wasteful number, since it uses less digits than its factorization.

16688388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390706 (or 1390704 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 16688388 is about 4085.1423475810. The cubic root of 16688388 is about 255.5473977092.

The spelling of 16688388 in words is "sixteen million, six hundred eighty-eight thousand, three hundred eighty-eight".