268643 has 2 divisors, whose sum is σ = 268644. Its totient is φ = 268642.

The previous prime is 268637. The next prime is 268661. The reversal of 268643 is 346862.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268643 is a prime.

It is a super-2 number, since 2×268643² = 144338122898, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (268613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134321 + 134322.

It is an arithmetic number, because the mean of its divisors is an integer number (134322).

2²⁶⁸⁶⁴³ is an apocalyptic number.

268643 is a deficient number, since it is larger than the sum of its proper divisors (1).

268643 is an equidigital number, since it uses as much as digits as its factorization.

268643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 268643 is about 518.3078235952. The cubic root of 268643 is about 64.5245784982.

The spelling of 268643 in words is "two hundred sixty-eight thousand, six hundred forty-three".