561244420 has 48 divisors (see below), whose sum is σ = 1353441600. Its totient is φ = 193345920.

The previous prime is 561244399. The next prime is 561244441. The reversal of 561244420 is 24442165.

It is an interprime number because it is at equal distance from previous prime (561244399) and next prime (561244441).

It is a super-2 number, since 2×561244420² = 629990597962272800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 62955 + ... + 71314.

It is an arithmetic number, because the mean of its divisors is an integer number (28196700).

Almost surely, 2^561244420 is an apocalyptic number.

It is an amenable number.

561244420 is an abundant number, since it is smaller than the sum of its proper divisors (792197180).

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

561244420 is a wasteful number, since it uses less digits than its factorization.

561244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134308 (or 134306 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 561244420 is about 23690.5977130169. The cubic root of 561244420 is about 824.8671570617.

Adding to 561244420 its reverse (24442165), we get a palindrome (585686585).

The spelling of 561244420 in words is "five hundred sixty-one million, two hundred forty-four thousand, four hundred twenty".