263440116 has 18 divisors (see below), whose sum is σ = 665918162. Its totient is φ = 87813360.

The previous prime is 263440081. The next prime is 263440117. The reversal of 263440116 is 611044362.

It can be written as a sum of positive squares in only one way, i.e., 261468900 + 1971216 = 16170^2 + 1404^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 263440116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263440117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3658855 + ... + 3658926.

Almost surely, 2^263440116 is an apocalyptic number.

It is an amenable number.

263440116 is an abundant number, since it is smaller than the sum of its proper divisors (402478046).

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

263440116 is a wasteful number, since it uses less digits than its factorization.

263440116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317791 (or 7317786 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 263440116 is about 16230.8384256637. The cubic root of 263440116 is about 641.0530482778.

Adding to 263440116 its reverse (611044362), we get a palindrome (874484478).

The spelling of 263440116 in words is "two hundred sixty-three million, four hundred forty thousand, one hundred sixteen".