561209040 has 160 divisors (see below), whose sum is σ = 2209263360. Its totient is φ = 128272896.

The previous prime is 561209029. The next prime is 561209041. The reversal of 561209040 is 40902165.

561209040 is a `hidden beast` number, since 5 + 612 + 0 + 9 + 0 + 40 = 666.

561209040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 561208995 and 561209013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561209041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3439 + ... + 33678.

It is an arithmetic number, because the mean of its divisors is an integer number (13807896).

Almost surely, 2^561209040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561209040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104631680).

561209040 is an abundant number, since it is smaller than the sum of its proper divisors (1648054320).

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

561209040 is a wasteful number, since it uses less digits than its factorization.

561209040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37146 (or 37134 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 561209040 is about 23689.8509915111. The cubic root of 561209040 is about 824.8498239045.

The spelling of 561209040 in words is "five hundred sixty-one million, two hundred nine thousand, forty".