263864 has 8 divisors (see below), whose sum is σ = 494760. Its totient is φ = 131928.

The previous prime is 263863. The next prime is 263867. The reversal of 263864 is 468362.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16484 + ... + 16499.

It is an arithmetic number, because the mean of its divisors is an integer number (61845).

2²⁶³⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

263864 is a deficient number, since it is larger than the sum of its proper divisors (230896).

263864 is a wasteful number, since it uses less digits than its factorization.

263864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32989 (or 32985 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 263864 is about 513.6769412773. The cubic root of 263864 is about 64.1396689333.

The spelling of 263864 in words is "two hundred sixty-three thousand, eight hundred sixty-four".