8678821945 has 4 divisors (see below), whose sum is σ = 10414586340. Its totient is φ = 6943057552.

The previous prime is 8678821937. The next prime is 8678821951. The reversal of 8678821945 is 5491288768.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4658881536 + 4019940409 = 68256^2 + 63403^2 .

It is a cyclic number.

It is not a de Polignac number, because 8678821945 - 2³ = 8678821937 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 8678821945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867882190 + ... + 867882199.

It is an arithmetic number, because the mean of its divisors is an integer number (2603646585).

Almost surely, 2^8678821945 is an apocalyptic number.

It is an amenable number.

8678821945 is a deficient number, since it is larger than the sum of its proper divisors (1735764395).

8678821945 is a wasteful number, since it uses less digits than its factorization.

8678821945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735764394.

The product of its digits is 7741440, while the sum is 58.

The square root of 8678821945 is about 93160.1950674214. The cubic root of 8678821945 is about 2055.0399050588.

The spelling of 8678821945 in words is "eight billion, six hundred seventy-eight million, eight hundred twenty-one thousand, nine hundred forty-five".