561077728 has 48 divisors (see below), whose sum is σ = 1147426560. Its totient is φ = 269873536.

The previous prime is 561077701. The next prime is 561077729. The reversal of 561077728 is 827770165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561077729) 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, 85575 + ... + 91897.

It is an arithmetic number, because the mean of its divisors is an integer number (23904720).

Almost surely, 2^561077728 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 561077728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573713280).

561077728 is an abundant number, since it is smaller than the sum of its proper divisors (586348832).

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

561077728 is a wasteful number, since it uses less digits than its factorization.

561077728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439 (or 6431 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 43.

The square root of 561077728 is about 23687.0793471884. The cubic root of 561077728 is about 824.7854859478.

It can be divided in two parts, 5610 and 77728, that added together give a palindrome (83338).

The spelling of 561077728 in words is "five hundred sixty-one million, seventy-seven thousand, seven hundred twenty-eight".