16161728 has 42 divisors (see below), whose sum is σ = 35268408. Its totient is φ = 7342720.

The previous prime is 16161727. The next prime is 16161751. The reversal of 16161728 is 82716161.

It is a happy number.

It is a super-2 number, since 2×16161728² = 522402903891968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 16161694 and 16161703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6701 + ... + 8787.

It is an arithmetic number, because the mean of its divisors is an integer number (839724).

Almost surely, 2^16161728 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 16161728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17634204).

16161728 is an abundant number, since it is smaller than the sum of its proper divisors (19106680).

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

16161728 is a wasteful number, since it uses less digits than its factorization.

16161728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2100 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 16161728 is about 4020.1651707361. The cubic root of 16161728 is about 252.8303841064.

Adding to 16161728 its reverse (82716161), we get a palindrome (98877889).

The spelling of 16161728 in words is "sixteen million, one hundred sixty-one thousand, seven hundred twenty-eight".