561402424 has 64 divisors (see below), whose sum is σ = 1279929600. Its totient is φ = 227520000.

The previous prime is 561402421. The next prime is 561402433. The reversal of 561402424 is 424204165.

It is a junction number, because it is equal to n+sod(n) for n = 561402392 and 561402401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561402421) by changing a digit.

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, 18549 + ... + 38299.

It is an arithmetic number, because the mean of its divisors is an integer number (19998900).

Almost surely, 2^561402424 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 561402424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639964800).

561402424 is an abundant number, since it is smaller than the sum of its proper divisors (718527176).

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

561402424 is a wasteful number, since it uses less digits than its factorization.

561402424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19804 (or 19800 counting only the distinct ones).

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

The square root of 561402424 is about 23693.9322190303. The cubic root of 561402424 is about 824.9445565434.

Adding to 561402424 its reverse (424204165), we get a palindrome (985606589).

It can be divided in two parts, 56140 and 2424, that added together give a square (58564 = 242²).

The spelling of 561402424 in words is "five hundred sixty-one million, four hundred two thousand, four hundred twenty-four".