561733640 has 64 divisors (see below), whose sum is σ = 1405071360. Its totient is φ = 200712960.

The previous prime is 561733603. The next prime is 561733643. The reversal of 561733640 is 46337165.

It is a self number, because there is not a number n which added to its sum of digits gives 561733640.

It is not an unprimeable number, because it can be changed into a prime (561733643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1304 + ... + 33543.

It is an arithmetic number, because the mean of its divisors is an integer number (21954240).

Almost surely, 2^561733640 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 561733640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702535680).

561733640 is an abundant number, since it is smaller than the sum of its proper divisors (843337720).

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

561733640 is a wasteful number, since it uses less digits than its factorization.

561733640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34902 (or 34898 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 561733640 is about 23700.9206572234. The cubic root of 561733640 is about 825.1067581465.

The spelling of 561733640 in words is "five hundred sixty-one million, seven hundred thirty-three thousand, six hundred forty".