561753728 has 64 divisors (see below), whose sum is σ = 1173016320. Its totient is φ = 267632640.

The previous prime is 561753727. The next prime is 561753739. The reversal of 561753728 is 827357165.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (561753727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264800 + ... + 266912.

It is an arithmetic number, because the mean of its divisors is an integer number (18328380).

Almost surely, 2^561753728 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 561753728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (586508160).

561753728 is an abundant number, since it is smaller than the sum of its proper divisors (611262592).

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

561753728 is a wasteful number, since it uses less digits than its factorization.

561753728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225 (or 2213 counting only the distinct ones).

The product of its digits is 352800, while the sum is 44.

The square root of 561753728 is about 23701.3444344408. The cubic root of 561753728 is about 825.1165935002.

The spelling of 561753728 in words is "five hundred sixty-one million, seven hundred fifty-three thousand, seven hundred twenty-eight".