28665216 has 96 divisors (see below), whose sum is σ = 83538000. Its totient is φ = 9434112.

The previous prime is 28665211. The next prime is 28665223. The reversal of 28665216 is 61256682.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28665211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171565 + ... + 171731.

Almost surely, 2^28665216 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 28665216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41769000).

28665216 is an abundant number, since it is smaller than the sum of its proper divisors (54872784).

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

28665216 is a wasteful number, since it uses less digits than its factorization.

28665216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 321 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28665216 is about 5353.9906611798. The cubic root of 28665216 is about 306.0448479698.

The spelling of 28665216 in words is "twenty-eight million, six hundred sixty-five thousand, two hundred sixteen".