561728394 has 24 divisors (see below), whose sum is σ = 1232487360. Its totient is φ = 184872168.

The previous prime is 561728383. The next prime is 561728417. The reversal of 561728394 is 493827165.

561728394 is a `hidden beast` number, since 5 + 617 + 28 + 3 + 9 + 4 = 666.

561728394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196092 + ... + 198935.

It is an arithmetic number, because the mean of its divisors is an integer number (51353640).

Almost surely, 2^561728394 is an apocalyptic number.

561728394 is an abundant number, since it is smaller than the sum of its proper divisors (670758966).

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

561728394 is a wasteful number, since it uses less digits than its factorization.

561728394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395114 (or 395111 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 561728394 is about 23700.8099861587. The cubic root of 561728394 is about 825.1041895961.

The spelling of 561728394 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, three hundred ninety-four".