561687180 has 24 divisors (see below), whose sum is σ = 1572724272. Its totient is φ = 149783232.

The previous prime is 561687151. The next prime is 561687193. The reversal of 561687180 is 81786165.

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, 4680667 + ... + 4680786.

It is an arithmetic number, because the mean of its divisors is an integer number (65530178).

Almost surely, 2^561687180 is an apocalyptic number.

It is an amenable number.

561687180 is an abundant number, since it is smaller than the sum of its proper divisors (1011037092).

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

561687180 is a wasteful number, since it uses less digits than its factorization.

561687180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361465 (or 9361463 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 561687180 is about 23699.9405062544. The cubic root of 561687180 is about 825.0840098105.

The spelling of 561687180 in words is "five hundred sixty-one million, six hundred eighty-seven thousand, one hundred eighty".