80644673 has 2 divisors, whose sum is σ = 80644674. Its totient is φ = 80644672.

The previous prime is 80644667. The next prime is 80644699. The reversal of 80644673 is 37644608.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 7661824 = 8543^2 + 2768^2 .

It is a cyclic number.

It is not a de Polignac number, because 80644673 - 2⁴ = 80644657 is a prime.

It is not a weakly prime, because it can be changed into another prime (80644643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40322336 + 40322337.

It is an arithmetic number, because the mean of its divisors is an integer number (40322337).

Almost surely, 2^80644673 is an apocalyptic number.

It is an amenable number.

80644673 is a deficient number, since it is larger than the sum of its proper divisors (1).

80644673 is an equidigital number, since it uses as much as digits as its factorization.

80644673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 80644673 is about 8980.2379144430. The cubic root of 80644673 is about 432.0412644197.

The spelling of 80644673 in words is "eighty million, six hundred forty-four thousand, six hundred seventy-three".