561728364 has 12 divisors (see below), whose sum is σ = 1310699544. Its totient is φ = 187242784.

The previous prime is 561728327. The next prime is 561728383. The reversal of 561728364 is 463827165.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23405337 + ... + 23405360.

It is an arithmetic number, because the mean of its divisors is an integer number (109224962).

Almost surely, 2^561728364 is an apocalyptic number.

It is an amenable number.

561728364 is an abundant number, since it is smaller than the sum of its proper divisors (748971180).

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

561728364 is a wasteful number, since it uses less digits than its factorization.

561728364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46810704 (or 46810702 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 561728364 is about 23700.8093532689. The cubic root of 561728364 is about 825.1041749075.

The spelling of 561728364 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, three hundred sixty-four".