263672643 has 16 divisors (see below), whose sum is σ = 378980000. Its totient is φ = 162100224.

The previous prime is 263672609. The next prime is 263672653. The reversal of 263672643 is 346276362.

It is a Cunningham number, because it is equal to 16238²-1.

It is not a de Polignac number, because 263672643 - 2⁶ = 263672579 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263672653) 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, 46005 + ... + 51417.

It is an arithmetic number, because the mean of its divisors is an integer number (23686250).

Almost surely, 2^263672643 is an apocalyptic number.

263672643 is a deficient number, since it is larger than the sum of its proper divisors (115307357).

263672643 is a wasteful number, since it uses less digits than its factorization.

263672643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678.

The product of its digits is 217728, while the sum is 39.

The square root of 263672643 is about 16237.9999692080. Note that the first 4 decimals coincide. The cubic root of 263672643 is about 641.2416025864.

The spelling of 263672643 in words is "two hundred sixty-three million, six hundred seventy-two thousand, six hundred forty-three".