80502809 has 4 divisors (see below), whose sum is σ = 80920116. Its totient is φ = 80085504.

The previous prime is 80502797. The next prime is 80502833. The reversal of 80502809 is 90820508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44262409 + 36240400 = 6653^2 + 6020^2 .

It is a cyclic number.

It is not a de Polignac number, because 80502809 - 2¹² = 80498713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80502839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208364 + ... + 208749.

It is an arithmetic number, because the mean of its divisors is an integer number (20230029).

Almost surely, 2^80502809 is an apocalyptic number.

It is an amenable number.

80502809 is a deficient number, since it is larger than the sum of its proper divisors (417307).

80502809 is a wasteful number, since it uses less digits than its factorization.

80502809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417306.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 80502809 is about 8972.3357605475. The cubic root of 80502809 is about 431.7877776347.

The spelling of 80502809 in words is "eighty million, five hundred two thousand, eight hundred nine".