8678069721 has 6 divisors (see below), whose sum is σ = 12534989610. Its totient is φ = 5785379808.

The previous prime is 8678069683. The next prime is 8678069843. The reversal of 8678069721 is 1279608768.

8678069721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5046681600 + 3631388121 = 71040^2 + 60261^2 .

It is not a de Polignac number, because 8678069721 - 2⁷ = 8678069593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8678069021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 482114976 + ... + 482114993.

It is an arithmetic number, because the mean of its divisors is an integer number (2089164935).

Almost surely, 2^8678069721 is an apocalyptic number.

It is an amenable number.

8678069721 is a deficient number, since it is larger than the sum of its proper divisors (3856919889).

8678069721 is a wasteful number, since it uses less digits than its factorization.

8678069721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964229975 (or 964229972 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 8678069721 is about 93156.1577191760. The cubic root of 8678069721 is about 2054.9805308330.

The spelling of 8678069721 in words is "eight billion, six hundred seventy-eight million, sixty-nine thousand, seven hundred twenty-one".