561720744 has 224 divisors, whose sum is σ = 1762790400. Its totient is φ = 166561920.

The previous prime is 561720737. The next prime is 561720763. The reversal of 561720744 is 447027165.

561720744 is a `hidden beast` number, since 561 + 7 + 20 + 74 + 4 = 666.

561720744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 561720699 and 561720708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2350177 + ... + 2350415.

It is an arithmetic number, because the mean of its divisors is an integer number (7869600).

Almost surely, 2^561720744 is an apocalyptic number.

561720744 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561720744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881395200).

561720744 is an abundant number, since it is smaller than the sum of its proper divisors (1201069656).

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

561720744 is a wasteful number, since it uses less digits than its factorization.

561720744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 561720744 is about 23700.6485987198. The cubic root of 561720744 is about 825.1004439688.

The spelling of 561720744 in words is "five hundred sixty-one million, seven hundred twenty thousand, seven hundred forty-four".