28231056 has 90 divisors (see below), whose sum is σ = 91929942. Its totient is φ = 8064000.

The previous prime is 28231043. The next prime is 28231057. The reversal of 28231056 is 65013282.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 11289600 = 4116^2 + 3360^2 .

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28231057) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5056 + ... + 9056.

Almost surely, 2^28231056 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 28231056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45964971).

28231056 is an abundant number, since it is smaller than the sum of its proper divisors (63698886).

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

28231056 is a wasteful number, since it uses less digits than its factorization.

28231056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029 (or 4013 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28231056 is about 5313.2905058918. The cubic root of 28231056 is about 304.4918745355.

The spelling of 28231056 in words is "twenty-eight million, two hundred thirty-one thousand, fifty-six".