16172728 has 64 divisors (see below), whose sum is σ = 36328320. Its totient is φ = 6652800.

The previous prime is 16172707. The next prime is 16172759. The reversal of 16172728 is 82727161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16172693 and 16172702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76543 + ... + 76753.

It is an arithmetic number, because the mean of its divisors is an integer number (567630).

Almost surely, 2^16172728 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 16172728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18164160).

16172728 is an abundant number, since it is smaller than the sum of its proper divisors (20155592).

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

16172728 is a wasteful number, since it uses less digits than its factorization.

16172728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 304 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 16172728 is about 4021.5330410181. The cubic root of 16172728 is about 252.8877315942.

Adding to 16172728 its reverse (82727161), we get a palindrome (98899889).

It can be divided in two parts, 16172 and 728, that added together give a square (16900 = 130²).

The spelling of 16172728 in words is "sixteen million, one hundred seventy-two thousand, seven hundred twenty-eight".