867768641 has 2 divisors, whose sum is σ = 867768642. Its totient is φ = 867768640.

The previous prime is 867768631. The next prime is 867768667. The reversal of 867768641 is 146867768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766182400 + 101586241 = 27680^2 + 10079^2 .

It is a cyclic number.

It is not a de Polignac number, because 867768641 - 2¹⁰ = 867767617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (867768611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433884320 + 433884321.

It is an arithmetic number, because the mean of its divisors is an integer number (433884321).

Almost surely, 2^867768641 is an apocalyptic number.

It is an amenable number.

867768641 is a deficient number, since it is larger than the sum of its proper divisors (1).

867768641 is an equidigital number, since it uses as much as digits as its factorization.

867768641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The square root of 867768641 is about 29457.9130455638. The cubic root of 867768641 is about 953.8234246226.

The spelling of 867768641 in words is "eight hundred sixty-seven million, seven hundred sixty-eight thousand, six hundred forty-one".