561671440 has 40 divisors (see below), whose sum is σ = 1424605248. Its totient is φ = 204243840.

The previous prime is 561671413. The next prime is 561671447. The reversal of 561671440 is 44176165.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 561671396 and 561671405.

It is not an unprimeable number, because it can be changed into a prime (561671447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318252 + ... + 320011.

Almost surely, 2^561671440 is an apocalyptic number.

It is an amenable number.

561671440 is an abundant number, since it is smaller than the sum of its proper divisors (862933808).

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

561671440 is a wasteful number, since it uses less digits than its factorization.

561671440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638287 (or 638281 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 561671440 is about 23699.6084355839. The cubic root of 561671440 is about 825.0763027070.

The spelling of 561671440 in words is "five hundred sixty-one million, six hundred seventy-one thousand, four hundred forty".