16005009728 has 14 divisors (see below), whose sum is σ = 31759941306. Its totient is φ = 8002504832.

The previous prime is 16005009721. The next prime is 16005009791. The reversal of 16005009728 is 82790050061.

It can be written as a sum of positive squares in only one way, i.e., 10698178624 + 5306831104 = 103432^2 + 72848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16005009691 and 16005009700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16005009721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125039075 + ... + 125039202.

Almost surely, 2^16005009728 is an apocalyptic number.

It is an amenable number.

16005009728 is a deficient number, since it is larger than the sum of its proper divisors (15754931578).

16005009728 is an equidigital number, since it uses as much as digits as its factorization.

16005009728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250078289 (or 250078279 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

Adding to 16005009728 its reverse (82790050061), we get a palindrome (98795059789).

The spelling of 16005009728 in words is "sixteen billion, five million, nine thousand, seven hundred twenty-eight".