561720206 has 8 divisors (see below), whose sum is σ = 842947560. Its totient is φ = 280737688.

The previous prime is 561720197. The next prime is 561720233. The reversal of 561720206 is 602027165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

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, 55361 + ... + 64716.

It is an arithmetic number, because the mean of its divisors is an integer number (105368445).

Almost surely, 2^561720206 is an apocalyptic number.

561720206 is a deficient number, since it is larger than the sum of its proper divisors (281227354).

561720206 is a wasteful number, since it uses less digits than its factorization.

561720206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122418.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 561720206 is about 23700.6372488167. The cubic root of 561720206 is about 825.1001805495.

The spelling of 561720206 in words is "five hundred sixty-one million, seven hundred twenty thousand, two hundred six".