561980 has 12 divisors (see below), whose sum is σ = 1180200. Its totient is φ = 224784.

The previous prime is 561973. The next prime is 561983. The reversal of 561980 is 89165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561983) 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, 14030 + ... + 14069.

It is an arithmetic number, because the mean of its divisors is an integer number (98350).

2⁵⁶¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

561980 is an abundant number, since it is smaller than the sum of its proper divisors (618220).

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

561980 is a wasteful number, since it uses less digits than its factorization.

561980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28108 (or 28106 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 561980 is about 749.6532531778. The cubic root of 561980 is about 82.5227363108.

The spelling of 561980 in words is "five hundred sixty-one thousand, nine hundred eighty".