561547264 has 72 divisors (see below), whose sum is σ = 1198303470. Its totient is φ = 262176768.

The previous prime is 561547253. The next prime is 561547279. The reversal of 561547264 is 462745165.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 412902400 + 148644864 = 20320^2 + 12192^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4421569 + ... + 4421695.

Almost surely, 2^561547264 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 561547264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599151735).

561547264 is an abundant number, since it is smaller than the sum of its proper divisors (636756206).

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

561547264 is an equidigital number, since it uses as much as digits as its factorization.

561547264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 146 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 561547264 is about 23696.9885006513. The cubic root of 561547264 is about 825.0154947809.

The spelling of 561547264 in words is "five hundred sixty-one million, five hundred forty-seven thousand, two hundred sixty-four".