80605209 has 16 divisors (see below), whose sum is σ = 109812672. Its totient is φ = 52573248.

The previous prime is 80605207. The next prime is 80605219. The reversal of 80605209 is 90250608.

It is not a de Polignac number, because 80605209 - 2¹ = 80605207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80605207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97054 + ... + 97880.

It is an arithmetic number, because the mean of its divisors is an integer number (6863292).

Almost surely, 2^80605209 is an apocalyptic number.

It is an amenable number.

80605209 is a deficient number, since it is larger than the sum of its proper divisors (29207463).

80605209 is a wasteful number, since it uses less digits than its factorization.

80605209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 80605209 is about 8978.0403763850. The cubic root of 80605209 is about 431.9707788448.

The spelling of 80605209 in words is "eighty million, six hundred five thousand, two hundred nine".