561561736 has 16 divisors (see below), whose sum is σ = 1053357840. Its totient is φ = 280666320.

The previous prime is 561561727. The next prime is 561561757. The reversal of 561561736 is 637165165.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8691 + ... + 34621.

It is an arithmetic number, because the mean of its divisors is an integer number (65834865).

Almost surely, 2^561561736 is an apocalyptic number.

It is an amenable number.

561561736 is a deficient number, since it is larger than the sum of its proper divisors (491796104).

561561736 is a wasteful number, since it uses less digits than its factorization.

561561736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28644 (or 28640 counting only the distinct ones).

The product of its digits is 113400, while the sum is 40.

The square root of 561561736 is about 23697.2938539404. The cubic root of 561561736 is about 825.0225820571.

The spelling of 561561736 in words is "five hundred sixty-one million, five hundred sixty-one thousand, seven hundred thirty-six".