28080216 has 64 divisors (see below), whose sum is σ = 79142400. Its totient is φ = 9223200.

The previous prime is 28080211. The next prime is 28080229. The reversal of 28080216 is 61208082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28080216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28080211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14421 + ... + 16251.

It is an arithmetic number, because the mean of its divisors is an integer number (1236600).

Almost surely, 2^28080216 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 28080216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39571200).

28080216 is an abundant number, since it is smaller than the sum of its proper divisors (51062184).

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

28080216 is a wasteful number, since it uses less digits than its factorization.

28080216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1907 counting only the distinct ones).

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

The square root of 28080216 is about 5299.0769007441. The cubic root of 28080216 is about 303.9486004974.

Adding to 28080216 its reverse (61208082), we get a palindrome (89288298).

The spelling of 28080216 in words is "twenty-eight million, eighty thousand, two hundred sixteen".