561818430 has 72 divisors (see below), whose sum is σ = 1517009832. Its totient is φ = 149800752.

The previous prime is 561818393. The next prime is 561818437. The reversal of 561818430 is 34818165.

561818430 is a `hidden beast` number, since 5 + 618 + 1 + 8 + 4 + 30 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561818437) 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 35 ways as a sum of consecutive naturals, for example, 61329 + ... + 69891.

It is an arithmetic number, because the mean of its divisors is an integer number (21069581).

Almost surely, 2^561818430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561818430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758504916).

561818430 is an abundant number, since it is smaller than the sum of its proper divisors (955191402).

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

561818430 is an frugal number, since it uses more digits than its factorization.

561818430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8594 (or 8573 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 561818430 is about 23702.7093388077. The cubic root of 561818430 is about 825.1482708715.

The spelling of 561818430 in words is "five hundred sixty-one million, eight hundred eighteen thousand, four hundred thirty".