561872896 has 64 divisors (see below), whose sum is σ = 1211086800. Its totient is φ = 259129344.

The previous prime is 561872887. The next prime is 561872903. The reversal of 561872896 is 698278165.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425325 + ... + 426643.

Almost surely, 2^561872896 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 561872896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605543400).

561872896 is an abundant number, since it is smaller than the sum of its proper divisors (649213904).

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

561872896 is an equidigital number, since it uses as much as digits as its factorization.

561872896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 1334 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The square root of 561872896 is about 23703.8582513480. The cubic root of 561872896 is about 825.1749349270.

The spelling of 561872896 in words is "five hundred sixty-one million, eight hundred seventy-two thousand, eight hundred ninety-six".