561561072 has 40 divisors (see below), whose sum is σ = 1469072640. Its totient is φ = 184816320.

The previous prime is 561561067. The next prime is 561561073. The reversal of 561561072 is 270165165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561561073) 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, 70254 + ... + 77837.

It is an arithmetic number, because the mean of its divisors is an integer number (36726816).

Almost surely, 2^561561072 is an apocalyptic number.

It is an amenable number.

561561072 is an abundant number, since it is smaller than the sum of its proper divisors (907511568).

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

561561072 is a wasteful number, since it uses less digits than its factorization.

561561072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148181 (or 148175 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 561561072 is about 23697.2798438977. The cubic root of 561561072 is about 825.0222568835.

The spelling of 561561072 in words is "five hundred sixty-one million, five hundred sixty-one thousand, seventy-two".