16729728 has 64 divisors (see below), whose sum is σ = 46797600. Its totient is φ = 5280768.

The previous prime is 16729721. The next prime is 16729777. The reversal of 16729728 is 82792761.

16729728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 16729728.

It is not an unprimeable number, because it can be changed into a prime (16729721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6150 + ... + 8442.

Almost surely, 2^16729728 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 16729728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23398800).

16729728 is an abundant number, since it is smaller than the sum of its proper divisors (30067872).

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

16729728 is a wasteful number, since it uses less digits than its factorization.

16729728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 2317 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 16729728 is about 4090.1990171629. The cubic root of 16729728 is about 255.7582352926.

The spelling of 16729728 in words is "sixteen million, seven hundred twenty-nine thousand, seven hundred twenty-eight".