16728399872 has 42 divisors (see below), whose sum is σ = 33478185393. Its totient is φ = 8358346752.

The previous prime is 16728399841. The next prime is 16728399887. The reversal of 16728399872 is 27899382761.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 12558340096 + 4170059776 = 112064^2 + 64576^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=91456.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11705654 + ... + 11707082.

Almost surely, 2^16728399872 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 16728399872

16728399872 is an abundant number, since it is smaller than the sum of its proper divisors (16749785521).

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

16728399872 is an frugal number, since it uses more digits than its factorization.

16728399872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884 (or 1431 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 62.

The spelling of 16728399872 in words is "sixteen billion, seven hundred twenty-eight million, three hundred ninety-nine thousand, eight hundred seventy-two".