7678886821 has 8 divisors (see below), whose sum is σ = 7922810880. Its totient is φ = 7438630992.

The previous prime is 7678886773. The next prime is 7678886833. The reversal of 7678886821 is 1286888767.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7678886821 - 2⁷ = 7678886693 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 7678886821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7678886861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912805 + ... + 921178.

It is an arithmetic number, because the mean of its divisors is an integer number (990351360).

Almost surely, 2^7678886821 is an apocalyptic number.

It is an amenable number.

7678886821 is a deficient number, since it is larger than the sum of its proper divisors (243924059).

7678886821 is a wasteful number, since it uses less digits than its factorization.

7678886821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834115.

The product of its digits is 14450688, while the sum is 61.

The square root of 7678886821 is about 87629.2577909912. The cubic root of 7678886821 is about 1972.8743307094.

The spelling of 7678886821 in words is "seven billion, six hundred seventy-eight million, eight hundred eighty-six thousand, eight hundred twenty-one".