561899520 has 576 divisors, whose sum is σ = 2432626560. Its totient is φ = 116785152.

The previous prime is 561899519. The next prime is 561899557. The reversal of 561899520 is 25998165.

561899520 is a `hidden beast` number, since 5 + 618 + 9 + 9 + 5 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8386527 + ... + 8386593.

It is an arithmetic number, because the mean of its divisors is an integer number (4223310).

Almost surely, 2^561899520 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 561899520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216313280).

561899520 is an abundant number, since it is smaller than the sum of its proper divisors (1870727040).

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

561899520 is a wasteful number, since it uses less digits than its factorization.

561899520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 561899520 is about 23704.4198410339. The cubic root of 561899520 is about 825.1879681893.

The spelling of 561899520 in words is "five hundred sixty-one million, eight hundred ninety-nine thousand, five hundred twenty".