80728987 has 2 divisors, whose sum is σ = 80728988. Its totient is φ = 80728986.

The previous prime is 80728957. The next prime is 80728993. The reversal of 80728987 is 78982708.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80728987 - 2⁷ = 80728859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80728987.

It is not a weakly prime, because it can be changed into another prime (80728957) 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, 40364493 + 40364494.

It is an arithmetic number, because the mean of its divisors is an integer number (40364494).

Almost surely, 2^80728987 is an apocalyptic number.

80728987 is a deficient number, since it is larger than the sum of its proper divisors (1).

80728987 is an equidigital number, since it uses as much as digits as its factorization.

80728987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 80728987 is about 8984.9311071371. The cubic root of 80728987 is about 432.1917783483.

The spelling of 80728987 in words is "eighty million, seven hundred twenty-eight thousand, nine hundred eighty-seven".