28002816 has 120 divisors (see below), whose sum is σ = 82985760. Its totient is φ = 9086976.

The previous prime is 28002811. The next prime is 28002817. The reversal of 28002816 is 61820082.

It is a self number, because there is not a number n which added to its sum of digits gives 28002816.

It is not an unprimeable number, because it can be changed into a prime (28002811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271821 + ... + 271923.

It is an arithmetic number, because the mean of its divisors is an integer number (691548).

Almost surely, 2^28002816 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 28002816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41492880).

28002816 is an abundant number, since it is smaller than the sum of its proper divisors (54982944).

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

28002816 is a wasteful number, since it uses less digits than its factorization.

28002816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28002816 is about 5291.7687024283. The cubic root of 28002816 is about 303.6690766493.

Adding to 28002816 its reverse (61820082), we get a palindrome (89822898).

The spelling of 28002816 in words is "twenty-eight million, two thousand, eight hundred sixteen".