844479820787 has 4 divisors (see below), whose sum is σ = 844512136920. Its totient is φ = 844447504656.

The previous prime is 844479820777. The next prime is 844479820799. The reversal of 844479820787 is 787028974448.

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

It is a cyclic number.

It is not a de Polignac number, because 844479820787 - 2²⁸ = 844211385331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844479820777) 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, 16118837 + ... + 16171142.

It is an arithmetic number, because the mean of its divisors is an integer number (211128034230).

Almost surely, 2^844479820787 is an apocalyptic number.

844479820787 is a deficient number, since it is larger than the sum of its proper divisors (32316133).

844479820787 is a wasteful number, since it uses less digits than its factorization.

844479820787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32316132.

The product of its (nonzero) digits is 202309632, while the sum is 68.

The spelling of 844479820787 in words is "eight hundred forty-four billion, four hundred seventy-nine million, eight hundred twenty thousand, seven hundred eighty-seven".