16688648 has 8 divisors (see below), whose sum is σ = 31291230. Its totient is φ = 8344320.

The previous prime is 16688647. The next prime is 16688677. The reversal of 16688648 is 84688661.

16688648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 16630084 + 58564 = 4078^2 + 242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (16688647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043033 + ... + 1043048.

Almost surely, 2^16688648 is an apocalyptic number.

It is an amenable number.

16688648 is a deficient number, since it is larger than the sum of its proper divisors (14602582).

16688648 is a wasteful number, since it uses less digits than its factorization.

16688648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086087 (or 2086083 counting only the distinct ones).

The product of its digits is 442368, while the sum is 47.

The square root of 16688648 is about 4085.1741700936. The cubic root of 16688648 is about 255.5487248192.

The spelling of 16688648 in words is "sixteen million, six hundred eighty-eight thousand, six hundred forty-eight".