561618324 has 108 divisors (see below), whose sum is σ = 1574305824. Its totient is φ = 168461568.

The previous prime is 561618319. The next prime is 561618349. The reversal of 561618324 is 423816165.

It is a happy number.

561618324 is a `hidden beast` number, since 5 + 6 + 1 + 618 + 32 + 4 = 666.

561618324 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 238119 + ... + 240465.

Almost surely, 2^561618324 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 561618324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787152912).

561618324 is an abundant number, since it is smaller than the sum of its proper divisors (1012687500).

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

561618324 is a wasteful number, since it uses less digits than its factorization.

561618324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414 (or 2392 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 561618324 is about 23698.4877998576. The cubic root of 561618324 is about 825.0502933527.

The spelling of 561618324 in words is "five hundred sixty-one million, six hundred eighteen thousand, three hundred twenty-four".