561297648 has 40 divisors (see below), whose sum is σ = 1450880848. Its totient is φ = 186988032.

The previous prime is 561297643. The next prime is 561297673. The reversal of 561297648 is 846792165.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 561297597 and 561297606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561297643) 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, 135090 + ... + 139182.

Almost surely, 2^561297648 is an apocalyptic number.

It is an amenable number.

561297648 is an abundant number, since it is smaller than the sum of its proper divisors (889583200).

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

561297648 is a wasteful number, since it uses less digits than its factorization.

561297648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6961 (or 6955 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 561297648 is about 23691.7210856451. The cubic root of 561297648 is about 824.8932328317.

The spelling of 561297648 in words is "five hundred sixty-one million, two hundred ninety-seven thousand, six hundred forty-eight".