561638746 has 24 divisors (see below), whose sum is σ = 910865844. Its totient is φ = 259536960.

The previous prime is 561638743. The next prime is 561638783. The reversal of 561638746 is 647836165.

It can be written as a sum of positive squares in 2 ways, for example, as 493328521 + 68310225 = 22211^2 + 8265^2 .

It is a junction number, because it is equal to n+sod(n) for n = 561638696 and 561638705.

It is not an unprimeable number, because it can be changed into a prime (561638743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20116 + ... + 39088.

Almost surely, 2^561638746 is an apocalyptic number.

561638746 is a deficient number, since it is larger than the sum of its proper divisors (349227098).

561638746 is a wasteful number, since it uses less digits than its factorization.

561638746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19054 (or 19035 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 561638746 is about 23698.9186673148. The cubic root of 561638746 is about 825.0602936039.

The spelling of 561638746 in words is "five hundred sixty-one million, six hundred thirty-eight thousand, seven hundred forty-six".