6821768836 has 27 divisors (see below), whose sum is σ = 12154964367. Its totient is φ = 3350012640.

The previous prime is 6821768831. The next prime is 6821768839. The reversal of 6821768836 is 6388671286.

The square root of 6821768836 is 82594.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 74132100 + 6747636736 = 8610^2 + 82144^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6821768831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10076130 + ... + 10076806.

Almost surely, 2^6821768836 is an apocalyptic number.

6821768836 is the 82594-th square number.

It is an amenable number.

6821768836 is a deficient number, since it is larger than the sum of its proper divisors (5333195531).

6821768836 is an frugal number, since it uses more digits than its factorization.

6821768836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480 (or 740 counting only the distinct ones).

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

The cubic root of 6821768836 is about 1896.5559803883. Note that the first 3 decimals are identical.

The spelling of 6821768836 in words is "six billion, eight hundred twenty-one million, seven hundred sixty-eight thousand, eight hundred thirty-six".