561728 has 28 divisors (see below), whose sum is σ = 1139952. Its totient is φ = 274560.

The previous prime is 561713. The next prime is 561733. The reversal of 561728 is 827165.

Its product of digits (3360) is a multiple of the sum of its prime factors (210).

It is a plaindrome in base 13.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 561728.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4223 + ... + 4353.

2⁵⁶¹⁷²⁸ 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 561728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569976).

561728 is an abundant number, since it is smaller than the sum of its proper divisors (578224).

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

561728 is a wasteful number, since it uses less digits than its factorization.

561728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 200 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 561728 is about 749.4851566242. The cubic root of 561728 is about 82.5103996685.

The spelling of 561728 in words is "five hundred sixty-one thousand, seven hundred twenty-eight".