561486640 has 80 divisors (see below), whose sum is σ = 1533714336. Its totient is φ = 188467200.

The previous prime is 561486637. The next prime is 561486641. The reversal of 561486640 is 46684165.

It is a happy number.

561486640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 561486593 and 561486602.

It is not an unprimeable number, because it can be changed into a prime (561486641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13101 + ... + 35980.

Almost surely, 2^561486640 is an apocalyptic number.

It is an amenable number.

561486640 is an abundant number, since it is smaller than the sum of its proper divisors (972227696).

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

561486640 is a wasteful number, since it uses less digits than its factorization.

561486640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49118 (or 49112 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 561486640 is about 23695.7093162454. The cubic root of 561486640 is about 824.9858044695.

The spelling of 561486640 in words is "five hundred sixty-one million, four hundred eighty-six thousand, six hundred forty".