5581728 has 36 divisors (see below), whose sum is σ = 15873858. Its totient is φ = 1860480.

The previous prime is 5581727. The next prime is 5581733. The reversal of 5581728 is 8271855.

5581728 is a `hidden beast` number, since 5 + 581 + 72 + 8 = 666.

5581728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4112784 + 1468944 = 2028^2 + 1212^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5581692 and 5581701.

It is not an unprimeable number, because it can be changed into a prime (5581727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9403 + ... + 9978.

Almost surely, 2^5581728 is an apocalyptic number.

It is an amenable number.

5581728 is an abundant number, since it is smaller than the sum of its proper divisors (10292130).

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

5581728 is a wasteful number, since it uses less digits than its factorization.

5581728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19397 (or 19386 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 5581728 is about 2362.5680942568. The cubic root of 5581728 is about 177.3874496429.

The spelling of 5581728 in words is "five million, five hundred eighty-one thousand, seven hundred twenty-eight".