561784 has 8 divisors (see below), whose sum is σ = 1053360. Its totient is φ = 280888.

The previous prime is 561767. The next prime is 561787. The reversal of 561784 is 487165.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561787) by changing a digit.

561784 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35104 + ... + 35119.

It is an arithmetic number, because the mean of its divisors is an integer number (131670).

2⁵⁶¹⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

561784 is a deficient number, since it is larger than the sum of its proper divisors (491576).

561784 is a wasteful number, since it uses less digits than its factorization.

561784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70229 (or 70225 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 561784 is about 749.5225146718. The cubic root of 561784 is about 82.5131414634.

The spelling of 561784 in words is "five hundred sixty-one thousand, seven hundred eighty-four".