263561564 has 24 divisors (see below), whose sum is σ = 531965280. Its totient is φ = 111917376.

The previous prime is 263561563. The next prime is 263561581. The reversal of 263561564 is 465165362.

It is a happy number.

263561564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263561561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40127 + ... + 46230.

It is an arithmetic number, because the mean of its divisors is an integer number (22165220).

Almost surely, 2^263561564 is an apocalyptic number.

It is an amenable number.

263561564 is an abundant number, since it is smaller than the sum of its proper divisors (268403716).

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

263561564 is a wasteful number, since it uses less digits than its factorization.

263561564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86477 (or 86475 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 263561564 is about 16234.5792677236. The cubic root of 263561564 is about 641.1515433374.

The spelling of 263561564 in words is "two hundred sixty-three million, five hundred sixty-one thousand, five hundred sixty-four".