561869568 has 288 divisors, whose sum is σ = 1848593600. Its totient is φ = 168210432.

The previous prime is 561869557. The next prime is 561869593. The reversal of 561869568 is 865968165.

It is a happy number.

561869568 is a `hidden beast` number, since 5 + 6 + 18 + 69 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×561869568² = 631394822889013248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15185646 + ... + 15185682.

Almost surely, 2^561869568 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 561869568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924296800).

561869568 is an abundant number, since it is smaller than the sum of its proper divisors (1286724032).

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

561869568 is an equidigital number, since it uses as much as digits as its factorization.

561869568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 55 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 561869568 is about 23703.7880517018. The cubic root of 561869568 is about 825.1733057403.

The spelling of 561869568 in words is "five hundred sixty-one million, eight hundred sixty-nine thousand, five hundred sixty-eight".