561627840 has 224 divisors, whose sum is σ = 1925360640. Its totient is φ = 138240000.

The previous prime is 561627839. The next prime is 561627851. The reversal of 561627840 is 48726165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 747465 + ... + 748215.

It is an arithmetic number, because the mean of its divisors is an integer number (8595360).

Almost surely, 2^561627840 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 561627840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962680320).

561627840 is an abundant number, since it is smaller than the sum of its proper divisors (1363732800).

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

561627840 is a wasteful number, since it uses less digits than its factorization.

561627840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 561627840 is about 23698.6885713113. The cubic root of 561627840 is about 825.0549531806.

The spelling of 561627840 in words is "five hundred sixty-one million, six hundred twenty-seven thousand, eight hundred forty".