16981728 has 48 divisors (see below), whose sum is σ = 46521216. Its totient is φ = 5413760.

The previous prime is 16981703. The next prime is 16981787. The reversal of 16981728 is 82718961.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 16981728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1638 + ... + 6053.

It is an arithmetic number, because the mean of its divisors is an integer number (969192).

Almost surely, 2^16981728 is an apocalyptic number.

It is an amenable number.

16981728 is an abundant number, since it is smaller than the sum of its proper divisors (29539488).

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

16981728 is a wasteful number, since it uses less digits than its factorization.

16981728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7727 (or 7719 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 16981728 is about 4120.8892244272. The cubic root of 16981728 is about 257.0360035758.

The spelling of 16981728 in words is "sixteen million, nine hundred eighty-one thousand, seven hundred twenty-eight".