263188240 has 40 divisors (see below), whose sum is σ = 699330240. Its totient is φ = 90235776.

The previous prime is 263188231. The next prime is 263188243. The reversal of 263188240 is 42881362.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 263188196 and 263188205.

It is not an unprimeable number, because it can be changed into a prime (263188243) 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, 234430 + ... + 235549.

It is an arithmetic number, because the mean of its divisors is an integer number (17483256).

Almost surely, 2^263188240 is an apocalyptic number.

263188240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263188240 is an abundant number, since it is smaller than the sum of its proper divisors (436142000).

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

263188240 is a wasteful number, since it uses less digits than its factorization.

263188240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469999 (or 469993 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 263188240 is about 16223.0773899405. The cubic root of 263188240 is about 640.8486787905.

The spelling of 263188240 in words is "two hundred sixty-three million, one hundred eighty-eight thousand, two hundred forty".