561944136 has 128 divisors (see below), whose sum is σ = 1578528000. Its totient is φ = 165516288.

The previous prime is 561944093. The next prime is 561944137. The reversal of 561944136 is 631449165.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 561944094 and 561944103.

It is not an unprimeable number, because it can be changed into a prime (561944137) 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, 1565125 + ... + 1565483.

It is an arithmetic number, because the mean of its divisors is an integer number (12332250).

Almost surely, 2^561944136 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 561944136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789264000).

561944136 is an abundant number, since it is smaller than the sum of its proper divisors (1016583864).

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

561944136 is a wasteful number, since it uses less digits than its factorization.

561944136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 579 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 561944136 is about 23705.3609126712. The cubic root of 561944136 is about 825.2098081629.

The spelling of 561944136 in words is "five hundred sixty-one million, nine hundred forty-four thousand, one hundred thirty-six".