16489697728 has 28 divisors (see below), whose sum is σ = 37396279792. Its totient is φ = 7067013120.

The previous prime is 16489697699. The next prime is 16489697753. The reversal of 16489697728 is 82779698461.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18403233 + ... + 18404128.

Almost surely, 2^16489697728 is an apocalyptic number.

It is an amenable number.

16489697728 is an abundant number, since it is smaller than the sum of its proper divisors (20906582064).

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

16489697728 is an equidigital number, since it uses as much as digits as its factorization.

16489697728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36807380 (or 36807370 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 67.

The spelling of 16489697728 in words is "sixteen billion, four hundred eighty-nine million, six hundred ninety-seven thousand, seven hundred twenty-eight".