5661810 has 192 divisors, whose sum is σ = 19768320. Its totient is φ = 1088640.

The previous prime is 5661797. The next prime is 5661811. The reversal of 5661810 is 181665.

It is a super-2 number, since 2×5661810² = 64112184952200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 131649 + ... + 131691.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

Almost surely, 2^5661810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9884160).

5661810 is an abundant number, since it is smaller than the sum of its proper divisors (14106510).

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

5661810 is a wasteful number, since it uses less digits than its factorization.

5661810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 5661810 is about 2379.4558201404. The cubic root of 5661810 is about 178.2317605609.

The spelling of 5661810 in words is "five million, six hundred sixty-one thousand, eight hundred ten".