80689643 has 2 divisors, whose sum is σ = 80689644. Its totient is φ = 80689642.

The previous prime is 80689627. The next prime is 80689649. The reversal of 80689643 is 34698608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80689643 - 2⁴ = 80689627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80689594 and 80689603.

It is not a weakly prime, because it can be changed into another prime (80689649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40344821 + 40344822.

It is an arithmetic number, because the mean of its divisors is an integer number (40344822).

Almost surely, 2^80689643 is an apocalyptic number.

80689643 is a deficient number, since it is larger than the sum of its proper divisors (1).

80689643 is an equidigital number, since it uses as much as digits as its factorization.

80689643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 80689643 is about 8982.7413967007. The cubic root of 80689643 is about 432.1215560854.

The spelling of 80689643 in words is "eighty million, six hundred eighty-nine thousand, six hundred forty-three".