561890442 has 8 divisors (see below), whose sum is σ = 1123780896. Its totient is φ = 187296812.

The previous prime is 561890387. The next prime is 561890447. The reversal of 561890442 is 244098165.

It is a sphenic number, since it is the product of 3 distinct primes.

561890442 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 561890442.

It is not an unprimeable number, because it can be changed into a prime (561890447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46824198 + ... + 46824209.

It is an arithmetic number, because the mean of its divisors is an integer number (140472612).

Almost surely, 2^561890442 is an apocalyptic number.

561890442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

561890442 is a wasteful number, since it uses less digits than its factorization.

561890442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93648412.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 561890442 is about 23704.2283569831. The cubic root of 561890442 is about 825.1835242769.

The spelling of 561890442 in words is "five hundred sixty-one million, eight hundred ninety thousand, four hundred forty-two".