263960645 has 8 divisors (see below), whose sum is σ = 341118456. Its totient is φ = 194924736.

The previous prime is 263960611. The next prime is 263960647. The reversal of 263960645 is 546069362.

It can be written as a sum of positive squares in 4 ways, for example, as 23059204 + 240901441 = 4802^2 + 15521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263960645 - 2¹² = 263956549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263960647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2030402 + ... + 2030531.

It is an arithmetic number, because the mean of its divisors is an integer number (42639807).

Almost surely, 2^263960645 is an apocalyptic number.

It is an amenable number.

263960645 is a deficient number, since it is larger than the sum of its proper divisors (77157811).

263960645 is a wasteful number, since it uses less digits than its factorization.

263960645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060951.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 263960645 is about 16246.8656977277. The cubic root of 263960645 is about 641.4749875177.

The spelling of 263960645 in words is "two hundred sixty-three million, nine hundred sixty thousand, six hundred forty-five".