561727872 has 160 divisors (see below), whose sum is σ = 1770583320. Its totient is φ = 176173056.

The previous prime is 561727871. The next prime is 561727891. The reversal of 561727872 is 278727165.

561727872 is a `hidden beast` number, since 5 + 617 + 27 + 8 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561727871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 174663 + ... + 177849.

Almost surely, 2^561727872 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 561727872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885291660).

561727872 is an abundant number, since it is smaller than the sum of its proper divisors (1208855448).

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

561727872 is a wasteful number, since it uses less digits than its factorization.

561727872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230 (or 3209 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 561727872 is about 23700.7989738743. The cubic root of 561727872 is about 825.1039340132.

It can be divided in two parts, 5617 and 27872, that added together give a square (33489 = 183²).

The spelling of 561727872 in words is "five hundred sixty-one million, seven hundred twenty-seven thousand, eight hundred seventy-two".