6872978869 has 2 divisors, whose sum is σ = 6872978870. Its totient is φ = 6872978868.

The previous prime is 6872978867. The next prime is 6872978923. The reversal of 6872978869 is 9688792786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6715802500 + 157176369 = 81950^2 + 12537^2 .

It is a cyclic number.

It is not a de Polignac number, because 6872978869 - 2¹ = 6872978867 is a prime.

It is a super-2 number, since 2×6872978869² = 94475677067441038322, which contains 22 as substring.

Together with 6872978867, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6872978798 and 6872978807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6872978863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3436489434 + 3436489435.

It is an arithmetic number, because the mean of its divisors is an integer number (3436489435).

Almost surely, 2^6872978869 is an apocalyptic number.

It is an amenable number.

6872978869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6872978869 is an equidigital number, since it uses as much as digits as its factorization.

6872978869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 70.

The square root of 6872978869 is about 82903.4309844894. The cubic root of 6872978869 is about 1901.2898784184.

The spelling of 6872978869 in words is "six billion, eight hundred seventy-two million, nine hundred seventy-eight thousand, eight hundred sixty-nine".