561071720 has 64 divisors (see below), whose sum is σ = 1379635200. Its totient is φ = 203662080.

The previous prime is 561071713. The next prime is 561071779. The reversal of 561071720 is 27170165.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438041 + ... + 439319.

It is an arithmetic number, because the mean of its divisors is an integer number (21556800).

Almost surely, 2^561071720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561071720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689817600).

561071720 is an abundant number, since it is smaller than the sum of its proper divisors (818563480).

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

561071720 is a wasteful number, since it uses less digits than its factorization.

561071720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2294 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 561071720 is about 23686.9525266548. The cubic root of 561071720 is about 824.7825420129.

The spelling of 561071720 in words is "five hundred sixty-one million, seventy-one thousand, seven hundred twenty".