561505460 has 48 divisors (see below), whose sum is σ = 1200119760. Its totient is φ = 220646400.

The previous prime is 561505447. The next prime is 561505471. The reversal of 561505460 is 64505165.

It can be written as a sum of positive squares in 8 ways, for example, as 186540964 + 374964496 = 13658^2 + 19364^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275726 + ... + 277754.

It is an arithmetic number, because the mean of its divisors is an integer number (25002495).

Almost surely, 2^561505460 is an apocalyptic number.

It is an amenable number.

561505460 is an abundant number, since it is smaller than the sum of its proper divisors (638614300).

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

561505460 is a wasteful number, since it uses less digits than its factorization.

561505460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 561505460 is about 23696.1064312262. The cubic root of 561505460 is about 824.9950217024.

The spelling of 561505460 in words is "five hundred sixty-one million, five hundred five thousand, four hundred sixty".