268440649 has 2 divisors, whose sum is σ = 268440650. Its totient is φ = 268440648.

The previous prime is 268440631. The next prime is 268440673. The reversal of 268440649 is 946044862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257923600 + 10517049 = 16060^2 + 3243^2 .

It is a cyclic number.

It is not a de Polignac number, because 268440649 - 2¹⁷ = 268309577 is a prime.

It is not a weakly prime, because it can be changed into another prime (268440629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134220324 + 134220325.

It is an arithmetic number, because the mean of its divisors is an integer number (134220325).

Almost surely, 2^268440649 is an apocalyptic number.

It is an amenable number.

268440649 is a deficient number, since it is larger than the sum of its proper divisors (1).

268440649 is an equidigital number, since it uses as much as digits as its factorization.

268440649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 268440649 is about 16384.1584770168. The cubic root of 268440649 is about 645.0837373005.

The spelling of 268440649 in words is "two hundred sixty-eight million, four hundred forty thousand, six hundred forty-nine".