263561964 has 48 divisors (see below), whose sum is σ = 631247232. Its totient is φ = 85542912.

The previous prime is 263561959. The next prime is 263561993. The reversal of 263561964 is 469165362.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228012 + ... + 229164.

It is an arithmetic number, because the mean of its divisors is an integer number (13150984).

Almost surely, 2^263561964 is an apocalyptic number.

It is an amenable number.

263561964 is an abundant number, since it is smaller than the sum of its proper divisors (367685268).

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

263561964 is a wasteful number, since it uses less digits than its factorization.

263561964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1644 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 263561964 is about 16234.5915871019. The cubic root of 263561964 is about 641.1518676898.

The spelling of 263561964 in words is "two hundred sixty-three million, five hundred sixty-one thousand, nine hundred sixty-four".