28881056 has 24 divisors (see below), whose sum is σ = 58249044. Its totient is φ = 14087680.

The previous prime is 28881037. The next prime is 28881059. The reversal of 28881056 is 65018882.

It can be written as a sum of positive squares in 2 ways, for example, as 27920656 + 960400 = 5284^2 + 980^2 .

It is not an unprimeable number, because it can be changed into a prime (28881059) 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, 9695 + ... + 12318.

Almost surely, 2^28881056 is an apocalyptic number.

It is an amenable number.

28881056 is an abundant number, since it is smaller than the sum of its proper divisors (29367988).

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

28881056 is a wasteful number, since it uses less digits than its factorization.

28881056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22064 (or 22056 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28881056 is about 5374.1097867461. The cubic root of 28881056 is about 306.8110683101.

The spelling of 28881056 in words is "twenty-eight million, eight hundred eighty-one thousand, fifty-six".