561782640 has 80 divisors (see below), whose sum is σ = 1745888256. Its totient is φ = 149433600.

The previous prime is 561782623. The next prime is 561782653. The reversal of 561782640 is 46287165.

561782640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100725 + ... + 106155.

Almost surely, 2^561782640 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 561782640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872944128).

561782640 is an abundant number, since it is smaller than the sum of its proper divisors (1184105616).

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

561782640 is a wasteful number, since it uses less digits than its factorization.

561782640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5878 (or 5872 counting only the distinct ones).

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

The square root of 561782640 is about 23701.9543497999. The cubic root of 561782640 is about 825.1307487907.

The spelling of 561782640 in words is "five hundred sixty-one million, seven hundred eighty-two thousand, six hundred forty".