16728381396 has 18 divisors (see below), whose sum is σ = 42285630842. Its totient is φ = 5576127120.

The previous prime is 16728381353. The next prime is 16728381407. The reversal of 16728381396 is 69318382761.

It can be written as a sum of positive squares in only one way, i.e., 9360562500 + 7367818896 = 96750^2 + 85836^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 232338595 + ... + 232338666.

Almost surely, 2^16728381396 is an apocalyptic number.

It is an amenable number.

16728381396 is an abundant number, since it is smaller than the sum of its proper divisors (25557249446).

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

16728381396 is a wasteful number, since it uses less digits than its factorization.

16728381396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464677271 (or 464677266 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 16728381396 in words is "sixteen billion, seven hundred twenty-eight million, three hundred eighty-one thousand, three hundred ninety-six".