561672840 has 32 divisors (see below), whose sum is σ = 1685018880. Its totient is φ = 149779392.

The previous prime is 561672833. The next prime is 561672863. The reversal of 561672840 is 48276165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340184 + ... + 2340423.

It is an arithmetic number, because the mean of its divisors is an integer number (52656840).

Almost surely, 2^561672840 is an apocalyptic number.

It is an amenable number.

561672840 is an abundant number, since it is smaller than the sum of its proper divisors (1123346040).

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

561672840 is a wasteful number, since it uses less digits than its factorization.

561672840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680621 (or 4680617 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 561672840 is about 23699.6379719185. The cubic root of 561672840 is about 825.0769882239.

The spelling of 561672840 in words is "five hundred sixty-one million, six hundred seventy-two thousand, eight hundred forty".