263345440 has 24 divisors (see below), whose sum is σ = 622153980. Its totient is φ = 105338112.

The previous prime is 263345399. The next prime is 263345441. The reversal of 263345440 is 44543362.

It can be written as a sum of positive squares in 2 ways, for example, as 228251664 + 35093776 = 15108^2 + 5924^2 .

It is not an unprimeable number, because it can be changed into a prime (263345441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822795 + ... + 823114.

Almost surely, 2^263345440 is an apocalyptic number.

263345440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263345440 is an abundant number, since it is smaller than the sum of its proper divisors (358808540).

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

263345440 is a wasteful number, since it uses less digits than its factorization.

263345440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645924 (or 1645916 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

The square root of 263345440 is about 16227.9216167690. The cubic root of 263345440 is about 640.9762444721.

The spelling of 263345440 in words is "two hundred sixty-three million, three hundred forty-five thousand, four hundred forty".