561163264 has 44 divisors (see below), whose sum is σ = 1137296824. Its totient is φ = 276701184.

The previous prime is 561163243. The next prime is 561163289. The reversal of 561163264 is 462361165.

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, 70999 + ... + 78505.

Almost surely, 2^561163264 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 561163264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568648412).

561163264 is an abundant number, since it is smaller than the sum of its proper divisors (576133560).

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

561163264 is an equidigital number, since it uses as much as digits as its factorization.

561163264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7600 (or 7582 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 561163264 is about 23688.8848196786. The cubic root of 561163264 is about 824.8273965204.

The spelling of 561163264 in words is "five hundred sixty-one million, one hundred sixty-three thousand, two hundred sixty-four".