7821843668 has 24 divisors (see below), whose sum is σ = 13957786080. Its totient is φ = 3834024480.

The previous prime is 7821843619. The next prime is 7821843671. The reversal of 7821843668 is 8663481287.

It is a super-2 number, since 2×7821843668² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259403 + ... + 287981.

It is an arithmetic number, because the mean of its divisors is an integer number (581574420).

Almost surely, 2^7821843668 is an apocalyptic number.

It is an amenable number.

7821843668 is a deficient number, since it is larger than the sum of its proper divisors (6135942412).

7821843668 is a wasteful number, since it uses less digits than its factorization.

7821843668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29927 (or 29925 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 53.

The square root of 7821843668 is about 88441.1876220576. The cubic root of 7821843668 is about 1985.0420477233.

The spelling of 7821843668 in words is "seven billion, eight hundred twenty-one million, eight hundred forty-three thousand, six hundred sixty-eight".