12812784639 has 16 divisors (see below), whose sum is σ = 17836630272. Its totient is φ = 8165820608.

The previous prime is 12812784631. The next prime is 12812784641. The reversal of 12812784639 is 93648721821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12812784639 - 2³ = 12812784631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12812784591 and 12812784600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12812784631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71347 + ... + 175259.

It is an arithmetic number, because the mean of its divisors is an integer number (1114789392).

Almost surely, 2^12812784639 is an apocalyptic number.

12812784639 is a deficient number, since it is larger than the sum of its proper divisors (5023845633).

12812784639 is a wasteful number, since it uses less digits than its factorization.

12812784639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105726.

The product of its digits is 1161216, while the sum is 51.

The spelling of 12812784639 in words is "twelve billion, eight hundred twelve million, seven hundred eighty-four thousand, six hundred thirty-nine".