263878 has 4 divisors (see below), whose sum is σ = 395820. Its totient is φ = 131938.

The previous prime is 263869. The next prime is 263881. The reversal of 263878 is 878362.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a d-powerful number, because it can be written as 2² + 6⁴ + 8² + 3³ + 7³ + 8⁶ .

It is a congruent number.

It is an unprimeable number.

263878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 65968 + ... + 65971.

It is an arithmetic number, because the mean of its divisors is an integer number (98955).

2²⁶³⁸⁷⁸ is an apocalyptic number.

263878 is a deficient number, since it is larger than the sum of its proper divisors (131942).

263878 is a wasteful number, since it uses less digits than its factorization.

263878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131941.

The product of its digits is 16128, while the sum is 34.

The square root of 263878 is about 513.6905683386. The cubic root of 263878 is about 64.1408032796.

The spelling of 263878 in words is "two hundred sixty-three thousand, eight hundred seventy-eight".