561897648 has 120 divisors (see below), whose sum is σ = 1756377168. Its totient is φ = 172876032.

The previous prime is 561897629. The next prime is 561897653. The reversal of 561897648 is 846798165.

561897648 is a `hidden beast` number, since 561 + 8 + 9 + 76 + 4 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 561897594 and 561897603.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44986 + ... + 56102.

Almost surely, 2^561897648 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 561897648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878188584).

561897648 is an abundant number, since it is smaller than the sum of its proper divisors (1194479520).

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

561897648 is a wasteful number, since it uses less digits than its factorization.

561897648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11153 (or 11135 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 561897648 is about 23704.3803546939. The cubic root of 561897648 is about 825.1870518015.

The spelling of 561897648 in words is "five hundred sixty-one million, eight hundred ninety-seven thousand, six hundred forty-eight".