80684987 has 2 divisors, whose sum is σ = 80684988. Its totient is φ = 80684986.

The previous prime is 80684957. The next prime is 80684993. The reversal of 80684987 is 78948608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80684987 - 2⁸ = 80684731 is a prime.

It is not a weakly prime, because it can be changed into another prime (80684927) 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, 40342493 + 40342494.

It is an arithmetic number, because the mean of its divisors is an integer number (40342494).

Almost surely, 2^80684987 is an apocalyptic number.

80684987 is a deficient number, since it is larger than the sum of its proper divisors (1).

80684987 is an equidigital number, since it uses as much as digits as its factorization.

80684987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 80684987 is about 8982.4822293172. The cubic root of 80684987 is about 432.1132444170.

The spelling of 80684987 in words is "eighty million, six hundred eighty-four thousand, nine hundred eighty-seven".