561113280 has 336 divisors, whose sum is σ = 2376489024. Its totient is φ = 118333440.

The previous prime is 561113239. The next prime is 561113291. The reversal of 561113280 is 82311165.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×561113280² = 629696225984716800, which contains 22 as substring.

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, 261010 + ... + 263150.

It is an arithmetic number, because the mean of its divisors is an integer number (7072884).

Almost surely, 2^561113280 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 561113280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188244512).

561113280 is an abundant number, since it is smaller than the sum of its proper divisors (1815375744).

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

561113280 is a wasteful number, since it uses less digits than its factorization.

561113280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 561113280 is about 23687.8297866225. The cubic root of 561113280 is about 824.8029060857.

The spelling of 561113280 in words is "five hundred sixty-one million, one hundred thirteen thousand, two hundred eighty".