28489216 has 40 divisors (see below), whose sum is σ = 65062800. Its totient is φ = 12208128.

The previous prime is 28489211. The next prime is 28489231. The reversal of 28489216 is 61298482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28489211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (1626570).

Almost surely, 2^28489216 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 28489216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32531400).

28489216 is an abundant number, since it is smaller than the sum of its proper divisors (36573584).

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

28489216 is an frugal number, since it uses more digits than its factorization.

28489216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7974 (or 7958 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 28489216 is about 5337.5290163146. The cubic root of 28489216 is about 305.4172056328.

The spelling of 28489216 in words is "twenty-eight million, four hundred eighty-nine thousand, two hundred sixteen".