561687580 has 24 divisors (see below), whose sum is σ = 1182938400. Its totient is φ = 224028480.

The previous prime is 561687569. The next prime is 561687601. The reversal of 561687580 is 85786165.

It is a self number, because there is not a number n which added to its sum of digits gives 561687580.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33256 + ... + 47215.

It is an arithmetic number, because the mean of its divisors is an integer number (49289100).

Almost surely, 2^561687580 is an apocalyptic number.

It is an amenable number.

561687580 is an abundant number, since it is smaller than the sum of its proper divisors (621250820).

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

561687580 is a wasteful number, since it uses less digits than its factorization.

561687580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80829 (or 80827 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 561687580 is about 23699.9489450927. The cubic root of 561687580 is about 825.0842056689.

The spelling of 561687580 in words is "five hundred sixty-one million, six hundred eighty-seven thousand, five hundred eighty".