2809000236856 has 32 divisors (see below), whose sum is σ = 5745828956400. Its totient is φ = 1276785699840.

The previous prime is 2809000236839. The next prime is 2809000236869. The reversal of 2809000236856 is 6586320009082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244936 + ... + 4018408.

Almost surely, 2^{2809000236856} is an apocalyptic number.

It is an amenable number.

2809000236856 is an abundant number, since it is smaller than the sum of its proper divisors (2936828719544).

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

2809000236856 is a wasteful number, since it uses less digits than its factorization.

2809000236856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814759 (or 814755 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 2809000236856 in words is "two trillion, eight hundred nine billion, two hundred thirty-six thousand, eight hundred fifty-six".