80028078209 has 4 divisors (see below), whose sum is σ = 80028652080. Its totient is φ = 80027504340.

The previous prime is 80028078197. The next prime is 80028078211. The reversal of 80028078209 is 90287082008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80028078209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80028078209.

It is not an unprimeable number, because it can be changed into a prime (80028078509) 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, 71474 + ... + 406404.

It is an arithmetic number, because the mean of its divisors is an integer number (20007163020).

Almost surely, 2^80028078209 is an apocalyptic number.

It is an amenable number.

80028078209 is a deficient number, since it is larger than the sum of its proper divisors (573871).

80028078209 is a wasteful number, since it uses less digits than its factorization.

80028078209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573870.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 80028078209 in words is "eighty billion, twenty-eight million, seventy-eight thousand, two hundred nine".