561728056 has 8 divisors (see below), whose sum is σ = 1053240120. Its totient is φ = 280864024.

The previous prime is 561728033. The next prime is 561728087. The reversal of 561728056 is 650827165.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35107996 + ... + 35108011.

It is an arithmetic number, because the mean of its divisors is an integer number (131655015).

Almost surely, 2^561728056 is an apocalyptic number.

It is an amenable number.

561728056 is a deficient number, since it is larger than the sum of its proper divisors (491512064).

561728056 is a wasteful number, since it uses less digits than its factorization.

561728056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70216013 (or 70216009 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 561728056 is about 23700.8028555996. The cubic root of 561728056 is about 825.1040241038.

The spelling of 561728056 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, fifty-six".