809388078672 has 40 divisors (see below), whose sum is σ = 2090952259776. Its totient is φ = 269791760896.

The previous prime is 809388078539. The next prime is 809388078673. The reversal of 809388078672 is 276870883908.

It is a super-2 number, since 2×809388078672² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809388078673) 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, 4872733 + ... + 5036099.

Almost surely, 2^809388078672 is an apocalyptic number.

It is an amenable number.

809388078672 is an abundant number, since it is smaller than the sum of its proper divisors (1281564181104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809388078672 is a wasteful number, since it uses less digits than its factorization.

809388078672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266595 (or 266589 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 66.

The spelling of 809388078672 in words is "eight hundred nine billion, three hundred eighty-eight million, seventy-eight thousand, six hundred seventy-two".