263644423 has 16 divisors (see below), whose sum is σ = 325255680. Its totient is φ = 208698336.

The previous prime is 263644411. The next prime is 263644453. The reversal of 263644423 is 324446362.

It is a de Polignac number, because none of the positive numbers 2^k-263644423 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 (263644453) 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 15 ways as a sum of consecutive naturals, for example, 23565 + ... + 32902.

It is an arithmetic number, because the mean of its divisors is an integer number (20328480).

Almost surely, 2^263644423 is an apocalyptic number.

263644423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

263644423 is a deficient number, since it is larger than the sum of its proper divisors (61611257).

263644423 is a wasteful number, since it uses less digits than its factorization.

263644423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56526.

The product of its digits is 82944, while the sum is 34.

The square root of 263644423 is about 16237.1309965770. The cubic root of 263644423 is about 641.2187251231.

The spelling of 263644423 in words is "two hundred sixty-three million, six hundred forty-four thousand, four hundred twenty-three".