16216728 has 128 divisors (see below), whose sum is σ = 48211200. Its totient is φ = 4492800.

The previous prime is 16216723. The next prime is 16216741. The reversal of 16216728 is 82761261.

It is a Cunningham number, because it is equal to 4027²-1.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265818 + ... + 265878.

It is an arithmetic number, because the mean of its divisors is an integer number (376650).

Almost surely, 2^16216728 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 16216728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24105600).

16216728 is an abundant number, since it is smaller than the sum of its proper divisors (31994472).

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

16216728 is a wasteful number, since it uses less digits than its factorization.

16216728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 149 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 16216728 is about 4026.9998758381. Note that the first 3 decimals coincide. The cubic root of 16216728 is about 253.1168618630.

Adding to 16216728 its reverse (82761261), we get a palindrome (98977989).

The spelling of 16216728 in words is "sixteen million, two hundred sixteen thousand, seven hundred twenty-eight".