268816643 has 4 divisors (see below), whose sum is σ = 269345280. Its totient is φ = 268288008.

The previous prime is 268816633. The next prime is 268816649. The reversal of 268816643 is 346618862.

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

It is a cyclic number.

It is not a de Polignac number, because 268816643 - 2¹² = 268812547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 268816594 and 268816603.

It is not an unprimeable number, because it can be changed into a prime (268816649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263555 + ... + 264572.

It is an arithmetic number, because the mean of its divisors is an integer number (67336320).

Almost surely, 2^268816643 is an apocalyptic number.

268816643 is a deficient number, since it is larger than the sum of its proper divisors (528637).

268816643 is an equidigital number, since it uses as much as digits as its factorization.

268816643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528636.

The product of its digits is 331776, while the sum is 44.

The square root of 268816643 is about 16395.6287772077. The cubic root of 268816643 is about 645.3847777247.

The spelling of 268816643 in words is "two hundred sixty-eight million, eight hundred sixteen thousand, six hundred forty-three".