28216768 has 56 divisors (see below), whose sum is σ = 60533280. Its totient is φ = 13009920.

The previous prime is 28216751. The next prime is 28216777. The reversal of 28216768 is 86761282.

It is a self number, because there is not a number n which added to its sum of digits gives 28216768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42358 + ... + 43018.

Almost surely, 2^28216768 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 28216768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30266640).

28216768 is an abundant number, since it is smaller than the sum of its proper divisors (32316512).

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

28216768 is a wasteful number, since it uses less digits than its factorization.

28216768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725 (or 715 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 28216768 is about 5311.9457828558. The cubic root of 28216768 is about 304.4404971438.

The spelling of 28216768 in words is "twenty-eight million, two hundred sixteen thousand, seven hundred sixty-eight".