561728365 has 32 divisors (see below), whose sum is σ = 781208064. Its totient is φ = 383216640.

The previous prime is 561728327. The next prime is 561728383. The reversal of 561728365 is 563827165.

It is not a de Polignac number, because 561728365 - 2²³ = 553339757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342327 + ... + 343963.

It is an arithmetic number, because the mean of its divisors is an integer number (24412752).

Almost surely, 2^561728365 is an apocalyptic number.

561728365 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561728365 is a deficient number, since it is larger than the sum of its proper divisors (219479699).

561728365 is a wasteful number, since it uses less digits than its factorization.

561728365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037.

The product of its digits is 302400, while the sum is 43.

The square root of 561728365 is about 23700.8093743653. The cubic root of 561728365 is about 825.1041753971.

The spelling of 561728365 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, three hundred sixty-five".