6821797648 has 10 divisors (see below), whose sum is σ = 13217232974. Its totient is φ = 3410898816.

The previous prime is 6821797643. The next prime is 6821797679. The reversal of 6821797648 is 8467971286.

It can be written as a sum of positive squares in only one way, i.e., 6026106384 + 795691264 = 77628^2 + 28208^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6821797592 and 6821797601.

It is not an unprimeable number, because it can be changed into a prime (6821797643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213181161 + ... + 213181192.

Almost surely, 2^6821797648 is an apocalyptic number.

It is an amenable number.

6821797648 is a deficient number, since it is larger than the sum of its proper divisors (6395435326).

6821797648 is a wasteful number, since it uses less digits than its factorization.

6821797648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426362361 (or 426362355 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The square root of 6821797648 is about 82594.1744192652. The cubic root of 6821797648 is about 1896.5586504433.

The spelling of 6821797648 in words is "six billion, eight hundred twenty-one million, seven hundred ninety-seven thousand, six hundred forty-eight".