561055992 has 64 divisors (see below), whose sum is σ = 1606702080. Its totient is φ = 159933312.

The previous prime is 561055991. The next prime is 561056003. The reversal of 561055992 is 299550165.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561055991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74178 + ... + 81390.

It is an arithmetic number, because the mean of its divisors is an integer number (25104720).

Almost surely, 2^561055992 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 561055992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803351040).

561055992 is an abundant number, since it is smaller than the sum of its proper divisors (1045646088).

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

561055992 is a wasteful number, since it uses less digits than its factorization.

561055992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692 (or 7688 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 42.

The square root of 561055992 is about 23686.6205272090. The cubic root of 561055992 is about 824.7748351544.

The spelling of 561055992 in words is "five hundred sixty-one million, fifty-five thousand, nine hundred ninety-two".