561485856 has 48 divisors (see below), whose sum is σ = 1475409600. Its totient is φ = 186970368.

The previous prime is 561485839. The next prime is 561485887. The reversal of 561485856 is 658584165.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115605 + ... + 120363.

It is an arithmetic number, because the mean of its divisors is an integer number (30737700).

Almost surely, 2^561485856 is an apocalyptic number.

It is an amenable number.

561485856 is an abundant number, since it is smaller than the sum of its proper divisors (913923744).

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

561485856 is a wasteful number, since it uses less digits than its factorization.

561485856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001 (or 5993 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The square root of 561485856 is about 23695.6927731603. The cubic root of 561485856 is about 824.9854204953.

The spelling of 561485856 in words is "five hundred sixty-one million, four hundred eighty-five thousand, eight hundred fifty-six".