28890112 has 44 divisors (see below), whose sum is σ = 58585140. Its totient is φ = 14237696.

The previous prime is 28890097. The next prime is 28890131. The reversal of 28890112 is 21109882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3326976 + 25563136 = 1824^2 + 5056^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90978 + ... + 91294.

Almost surely, 2^28890112 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 28890112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29292570).

28890112 is an abundant number, since it is smaller than the sum of its proper divisors (29695028).

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

28890112 is an equidigital number, since it uses as much as digits as its factorization.

28890112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28890112 is about 5374.9522788579. The cubic root of 28890112 is about 306.8431330504.

Adding to 28890112 its reverse (21109882), we get a palindrome (49999994).

The spelling of 28890112 in words is "twenty-eight million, eight hundred ninety thousand, one hundred twelve".