561764 has 12 divisors (see below), whose sum is σ = 1123584. Its totient is φ = 240744.
The previous prime is 561761. The next prime is 561767. The reversal of 561764 is 467165.
It is an interprime number because it is at equal distance from previous prime (561761) and next prime (561767).
561764 is an admirable number.
It is not an unprimeable number, because it can be changed into a prime (561761) 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 3 ways as a sum of consecutive naturals, for example, 10004 + ... + 10059.
It is an arithmetic number, because the mean of its divisors is an integer number (93632).
2561764 is an apocalyptic number.
It is an amenable number.
561764 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.
561764 is a wasteful number, since it uses less digits than its factorization.
561764 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 20074 (or 20072 counting only the distinct ones).
The product of its digits is 5040, while the sum is 29.
The square root of 561764 is about 749.5091727257. The cubic root of 561764 is about 82.5121622718.
The spelling of 561764 in words is "five hundred sixty-one thousand, seven hundred sixty-four".
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