28285816 has 32 divisors (see below), whose sum is σ = 57430800. Its totient is φ = 12983040.

The previous prime is 28285811. The next prime is 28285843. The reversal of 28285816 is 61858282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21300 + ... + 22588.

Almost surely, 2^28285816 is an apocalyptic number.

28285816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28285816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28715400).

28285816 is an abundant number, since it is smaller than the sum of its proper divisors (29144984).

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

28285816 is a wasteful number, since it uses less digits than its factorization.

28285816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1515 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 28285816 is about 5318.4411249914. The cubic root of 28285816 is about 304.6886224688.

The spelling of 28285816 in words is "twenty-eight million, two hundred eighty-five thousand, eight hundred sixteen".