561280664 has 16 divisors (see below), whose sum is σ = 1202744400. Its totient is φ = 240548832.

The previous prime is 561280663. The next prime is 561280667. The reversal of 561280664 is 466082165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561280663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5011379 + ... + 5011490.

It is an arithmetic number, because the mean of its divisors is an integer number (75171525).

Almost surely, 2^561280664 is an apocalyptic number.

It is an amenable number.

561280664 is an abundant number, since it is smaller than the sum of its proper divisors (641463736).

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

561280664 is a wasteful number, since it uses less digits than its factorization.

561280664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10022882 (or 10022878 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 561280664 is about 23691.3626454875. The cubic root of 561280664 is about 824.8849127493.

The spelling of 561280664 in words is "five hundred sixty-one million, two hundred eighty thousand, six hundred sixty-four".