561798 has 36 divisors (see below), whose sum is σ = 1294020. Its totient is φ = 176088.

The previous prime is 561797. The next prime is 561809. The reversal of 561798 is 897165.

561798 is a `hidden beast` number, since 561 + 7 + 98 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9493 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (35945).

2⁵⁶¹⁷⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647010).

561798 is an abundant number, since it is smaller than the sum of its proper divisors (732222).

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

561798 is a wasteful number, since it uses less digits than its factorization.

561798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 87 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 561798 is about 749.5318538928. The cubic root of 561798 is about 82.5138268836.

The spelling of 561798 in words is "five hundred sixty-one thousand, seven hundred ninety-eight".