5561820 has 108 divisors (see below), whose sum is σ = 18758376. Its totient is φ = 1322880.

The previous prime is 5561819. The next prime is 5561821. The reversal of 5561820 is 281655.

It is an interprime number because it is at equal distance from previous prime (5561819) and next prime (5561821).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 104914 + ... + 104966.

Almost surely, 2^5561820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5561820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9379188).

5561820 is an abundant number, since it is smaller than the sum of its proper divisors (13196556).

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

5561820 is a wasteful number, since it uses less digits than its factorization.

5561820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 5561820 is about 2358.3511188964. The cubic root of 5561820 is about 177.1763061805.

The spelling of 5561820 in words is "five million, five hundred sixty-one thousand, eight hundred twenty".