561563720 has 32 divisors (see below), whose sum is σ = 1337844600. Its totient is φ = 211411968.

The previous prime is 561563701. The next prime is 561563731. The reversal of 561563720 is 27365165.

It can be written as a sum of positive squares in 4 ways, for example, as 483736036 + 77827684 = 21994^2 + 8822^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412235 + ... + 413594.

Almost surely, 2^561563720 is an apocalyptic number.

It is an amenable number.

561563720 is an abundant number, since it is smaller than the sum of its proper divisors (776280880).

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

561563720 is a wasteful number, since it uses less digits than its factorization.

561563720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825857 (or 825853 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 561563720 is about 23697.3357152233. The cubic root of 561563720 is about 825.0235536587.

The spelling of 561563720 in words is "five hundred sixty-one million, five hundred sixty-three thousand, seven hundred twenty".