7278821768 has 16 divisors (see below), whose sum is σ = 13652029980. Its totient is φ = 3638280448.

The previous prime is 7278821749. The next prime is 7278821783. The reversal of 7278821768 is 8671288727.

It can be written as a sum of positive squares in 2 ways, for example, as 6999330244 + 279491524 = 83662^2 + 16718^2 .

It is an unprimeable number.

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, 113621 + ... + 165732.

Almost surely, 2^7278821768 is an apocalyptic number.

It is an amenable number.

7278821768 is a deficient number, since it is larger than the sum of its proper divisors (6373208212).

7278821768 is a wasteful number, since it uses less digits than its factorization.

7278821768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282616 (or 282612 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 56.

The square root of 7278821768 is about 85316.0112054004. The cubic root of 7278821768 is about 1937.9996535177. Note that the first 3 decimals are identical.

The spelling of 7278821768 in words is "seven billion, two hundred seventy-eight million, eight hundred twenty-one thousand, seven hundred sixty-eight".