561224040 has 128 divisors (see below), whose sum is σ = 1822262400. Its totient is φ = 137456640.

The previous prime is 561224023. The next prime is 561224047. The reversal of 561224040 is 40422165.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 561224040.

It is not an unprimeable number, because it can be changed into a prime (561224047) 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, 356455 + ... + 358025.

It is an arithmetic number, because the mean of its divisors is an integer number (14236425).

Almost surely, 2^561224040 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 561224040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911131200).

561224040 is an abundant number, since it is smaller than the sum of its proper divisors (1261038360).

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

561224040 is a wasteful number, since it uses less digits than its factorization.

561224040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827 (or 1823 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 561224040 is about 23690.1675806652. The cubic root of 561224040 is about 824.8571727034.

The spelling of 561224040 in words is "five hundred sixty-one million, two hundred twenty-four thousand, forty".