80640109 has 16 divisors (see below), whose sum is σ = 91351296. Its totient is φ = 70545600.

The previous prime is 80640103. The next prime is 80640113. The reversal of 80640109 is 90104608.

It is a cyclic number.

It is not a de Polignac number, because 80640109 - 2³ = 80640101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80640101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30259 + ... + 32815.

It is an arithmetic number, because the mean of its divisors is an integer number (5709456).

Almost surely, 2^80640109 is an apocalyptic number.

It is an amenable number.

80640109 is a deficient number, since it is larger than the sum of its proper divisors (10711187).

80640109 is a wasteful number, since it uses less digits than its factorization.

80640109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 80640109 is about 8979.9837973128. The cubic root of 80640109 is about 432.0331139597.

The spelling of 80640109 in words is "eighty million, six hundred forty thousand, one hundred nine".