561426642 has 72 divisors (see below), whose sum is σ = 1453443264. Its totient is φ = 153415152.

The previous prime is 561426629. The next prime is 561426661. The reversal of 561426642 is 246624165.

561426642 is a `hidden beast` number, since 5 + 6 + 1 + 4 + 2 + 6 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 561426597 and 561426606.

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, 62443 + ... + 70865.

It is an arithmetic number, because the mean of its divisors is an integer number (20186712).

Almost surely, 2^561426642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561426642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726721632).

561426642 is an abundant number, since it is smaller than the sum of its proper divisors (892016622).

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

561426642 is a wasteful number, since it uses less digits than its factorization.

561426642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484 (or 8458 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 561426642 is about 23694.4432726325. The cubic root of 561426642 is about 824.9564186345.

The spelling of 561426642 in words is "five hundred sixty-one million, four hundred twenty-six thousand, six hundred forty-two".