561720078 has 24 divisors (see below), whose sum is σ = 1217502000. Its totient is φ = 187172064.

The previous prime is 561720043. The next prime is 561720083. The reversal of 561720078 is 870027165.

561720078 is a `hidden beast` number, since 561 + 7 + 20 + 0 + 78 = 666.

561720078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81823 + ... + 88421.

It is an arithmetic number, because the mean of its divisors is an integer number (50729250).

Almost surely, 2^561720078 is an apocalyptic number.

561720078 is an abundant number, since it is smaller than the sum of its proper divisors (655781922).

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

561720078 is a wasteful number, since it uses less digits than its factorization.

561720078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11336 (or 11333 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 561720078 is about 23700.6345484673. The cubic root of 561720078 is about 825.1001178773.

The spelling of 561720078 in words is "five hundred sixty-one million, seven hundred twenty thousand, seventy-eight".