263913664 has 84 divisors (see below), whose sum is σ = 619457232. Its totient is φ = 109278720.

The previous prime is 263913653. The next prime is 263913701. The reversal of 263913664 is 466319362.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430222 + ... + 430834.

Almost surely, 2^263913664 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 263913664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309728616).

263913664 is an abundant number, since it is smaller than the sum of its proper divisors (355543568).

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

263913664 is an equidigital number, since it uses as much as digits as its factorization.

263913664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 653 counting only the distinct ones).

The product of its digits is 139968, while the sum is 40.

The square root of 263913664 is about 16245.4197852810. The cubic root of 263913664 is about 641.4369276464.

The spelling of 263913664 in words is "two hundred sixty-three million, nine hundred thirteen thousand, six hundred sixty-four".