561720079 has 8 divisors (see below), whose sum is σ = 570360960. Its totient is φ = 553140696.

The previous prime is 561720043. The next prime is 561720083. The reversal of 561720079 is 970027165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561720079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561723079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3204 + ... + 33670.

It is an arithmetic number, because the mean of its divisors is an integer number (71295120).

Almost surely, 2^561720079 is an apocalyptic number.

561720079 is a deficient number, since it is larger than the sum of its proper divisors (8640881).

561720079 is a wasteful number, since it uses less digits than its factorization.

561720079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30749.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 561720079 is about 23700.6345695637. The cubic root of 561720079 is about 825.1001183669.

The spelling of 561720079 in words is "five hundred sixty-one million, seven hundred twenty thousand, seventy-nine".