728667268669 has 2 divisors, whose sum is σ = 728667268670. Its totient is φ = 728667268668.

The previous prime is 728667268661. The next prime is 728667268697. The reversal of 728667268669 is 966862766827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448281133444 + 280386135225 = 669538^2 + 529515^2 .

It is an emirp because it is prime and its reverse (966862766827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728667268669 - 2³ = 728667268661 is a prime.

It is a super-2 number, since 2×728667268669² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728667268661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364333634334 + 364333634335.

It is an arithmetic number, because the mean of its divisors is an integer number (364333634335).

Almost surely, 2^728667268669 is an apocalyptic number.

It is an amenable number.

728667268669 is a deficient number, since it is larger than the sum of its proper divisors (1).

728667268669 is an equidigital number, since it uses as much as digits as its factorization.

728667268669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 877879296, while the sum is 73.

The spelling of 728667268669 in words is "seven hundred twenty-eight billion, six hundred sixty-seven million, two hundred sixty-eight thousand, six hundred sixty-nine".