268406689 has 4 divisors (see below), whose sum is σ = 268455600. Its totient is φ = 268357780.

The previous prime is 268406669. The next prime is 268406717. The reversal of 268406689 is 986604862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268406689 - 2⁵ = 268406657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268406609) 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, 15007 + ... + 27604.

It is an arithmetic number, because the mean of its divisors is an integer number (67113900).

Almost surely, 2^268406689 is an apocalyptic number.

It is an amenable number.

268406689 is a deficient number, since it is larger than the sum of its proper divisors (48911).

268406689 is an equidigital number, since it uses as much as digits as its factorization.

268406689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48910.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 268406689 is about 16383.1220773087. The cubic root of 268406689 is about 645.0565333137.

The spelling of 268406689 in words is "two hundred sixty-eight million, four hundred six thousand, six hundred eighty-nine".