80728717 has 2 divisors, whose sum is σ = 80728718. Its totient is φ = 80728716.

The previous prime is 80728649. The next prime is 80728723. The reversal of 80728717 is 71782708.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80622441 + 106276 = 8979^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 80728717 - 2¹⁹ = 80204429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80728717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80228717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40364358 + 40364359.

It is an arithmetic number, because the mean of its divisors is an integer number (40364359).

Almost surely, 2^80728717 is an apocalyptic number.

It is an amenable number.

80728717 is a deficient number, since it is larger than the sum of its proper divisors (1).

80728717 is an equidigital number, since it uses as much as digits as its factorization.

80728717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 80728717 is about 8984.9160819676. The cubic root of 80728717 is about 432.1912965226.

The spelling of 80728717 in words is "eighty million, seven hundred twenty-eight thousand, seven hundred seventeen".