80000009 has 8 divisors (see below), whose sum is σ = 83221320. Its totient is φ = 76809600.

The previous prime is 79999987. The next prime is 80000023. The reversal of 80000009 is 90000008.

It can be written as a sum of positive squares in 4 ways, for example, as 3822025 + 76177984 = 1955^2 + 8728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80000009 - 2²⁴ = 63222793 is a prime.

It is a Duffinian number.

80000009 is a modest number, since divided by 9 gives 8 as remainder.

It is not an unprimeable number, because it can be changed into a prime (80000059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2372 + ... + 12869.

It is an arithmetic number, because the mean of its divisors is an integer number (10402665).

Almost surely, 2^80000009 is an apocalyptic number.

It is an amenable number.

80000009 is a deficient number, since it is larger than the sum of its proper divisors (3221311).

80000009 is a wasteful number, since it uses less digits than its factorization.

80000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15451.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 80000009 is about 8944.2724131144. The cubic root of 80000009 is about 430.8869541646.

Subtracting 80000009 from its reverse (90000008), we obtain a palindrome (9999999).

The spelling of 80000009 in words is "eighty million, nine", and thus it is an aban number and an uban number.