80647809 has 16 divisors (see below), whose sum is σ = 117500160. Its totient is φ = 48796560.

The previous prime is 80647783. The next prime is 80647829. The reversal of 80647809 is 90874608.

It is a happy number.

It is not a de Polignac number, because 80647809 - 2⁷ = 80647681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80647829) 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, 22734 + ... + 26040.

It is an arithmetic number, because the mean of its divisors is an integer number (7343760).

Almost surely, 2^80647809 is an apocalyptic number.

It is an amenable number.

80647809 is a deficient number, since it is larger than the sum of its proper divisors (36852351).

80647809 is a wasteful number, since it uses less digits than its factorization.

80647809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 80647809 is about 8980.4125183646. The cubic root of 80647809 is about 432.0468645575.

The spelling of 80647809 in words is "eighty million, six hundred forty-seven thousand, eight hundred nine".