6812784649 has 4 divisors (see below), whose sum is σ = 7432128720. Its totient is φ = 6193440580.

The previous prime is 6812784631. The next prime is 6812784673. The reversal of 6812784649 is 9464872186.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 6812784649 - 2⁵ = 6812784617 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 6812784649.

It is not an unprimeable number, because it can be changed into a prime (6812784619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309672019 + ... + 309672040.

It is an arithmetic number, because the mean of its divisors is an integer number (1858032180).

Almost surely, 2^6812784649 is an apocalyptic number.

It is an amenable number.

6812784649 is a deficient number, since it is larger than the sum of its proper divisors (619344071).

6812784649 is a wasteful number, since it uses less digits than its factorization.

6812784649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619344070.

The product of its digits is 4644864, while the sum is 55.

The square root of 6812784649 is about 82539.5944320058. The cubic root of 6812784649 is about 1895.7230341965.

The spelling of 6812784649 in words is "six billion, eight hundred twelve million, seven hundred eighty-four thousand, six hundred forty-nine".