561728397 has 16 divisors (see below), whose sum is σ = 764157888. Its totient is φ = 366912000.

The previous prime is 561728383. The next prime is 561728417. The reversal of 561728397 is 793827165.

It is not a de Polignac number, because 561728397 - 2⁷ = 561728269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561728317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138397 + ... + 142397.

It is an arithmetic number, because the mean of its divisors is an integer number (47759868).

Almost surely, 2^561728397 is an apocalyptic number.

It is an amenable number.

561728397 is a deficient number, since it is larger than the sum of its proper divisors (202429491).

561728397 is a wasteful number, since it uses less digits than its factorization.

561728397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940.

The product of its digits is 635040, while the sum is 48.

The square root of 561728397 is about 23700.8100494477. The cubic root of 561728397 is about 825.1041910650.

The spelling of 561728397 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, three hundred ninety-seven".